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The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge. The process of adding air to wastewater in order to increase the dissolved oxygen (DO) levels. The portion of the treatment system where air is added to the wastewater and the bugs consume the pollutants. The aeration chamber is located downstream of the pretreatment chamber and upstream of the clarifier chamber. All of the equipment that is used to perform aeration in the treatment system including the air compressor units, air tubing/pipe and diffuser assemblies. The equipment above the ground that draws air in and delivers it to the diffusers through the tubes and pipes. A wall in a chamber that diverts or inhibits the flow or water in a particular direction. The microbes and bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic bugs. An aerobic treatment system uses aerobic bugs. A divider wall in the treatment tank that separates one chamber from the next. The final chamber of the treatment tank where solids are settled out of the wastewater prior to exiting the treatment tank. The process of settling solids out of the wastewater. This is typically accomplished in a specially designed chamber or basin where the water’s flow velocity is slowed and no mixing is provided. Pipe that conveys water from one chamber or tank to another. A fitting that allows compressed air to escape through small holes or slits. By forcing the air through the holes, the size of the bubbles is smaller and allows for more contact with the water. More contact with the water increases the amount of oxygen transferred to the water which increases dissolved oxygen. Applying a chemical (chlorine) or using Ultraviolet radiation (UV) to kill pathogens in the effluent that comes out of the main treatment tank of a wastewater treatment system. In order to fully disinfect the effluent, there must be the proper dosage of chemical or UV and a long enough contact time for the disinfectant to kill all of the pathogens. The clear, treated water that exits the main treatment tank. Effluent is also used as a term to describe the water that exits a chamber. The space between the waterline and the top of a chamber, basin or lagoon expressed in a linear measurement. The raw sewage or wastewater that enters the main treatment tank. influent is also used as a term to describe the water that enters a chamber. The pipe that conveys water into a chamber or tank. The natural mixing action created by the rising column of air above a diffuser. The water above the diffuser is pushed upward to the surface and then out to the side of the tank and then in a spinning motion under the surface. Laminar flow provides superior mixing at all depths in a chamber or basin. The bacteria that consume the pollutants in the raw wastewater or sewage. A septic treatment system uses anaerobic microbes. An aerobic treatment system uses aerobic microbes. Also called “Bugs”. The process of churning the contents of a chamber or basin. Mixing ensures that solids stay in suspension and the contents of the chamber or basin are uniform in dissolved oxygen, waste-strength and microbes. An acronym for the National Standards Federation. NSF provides standards and evaluation for a variety of equipment and products, so consumers can be assured of their quality and performance. The pipe that conveys water out of a chamber or tank. A portion of the treatment system that separates solids from the raw wastewater prior to biological treatment. The solids that float on the surface of the water or wastewater. The distance from the opening of the treatment system to an adjacent property or structure. Most areas have minimum setback requirements from nearby structures and property. The separation of solids from the wastewater using gravity. Get up to $8000 to repair or install a septic system on your property!!! Trinity River Authority of Texas has received funding through a Clean Water Act (CWA) Section 319(h) grant to fund the repair or installation of septic systems, also known as On-Site Sewage Facilities (OSSFs), in the Joe Pool Lake and Village Creek-Lake Arlington watershed in an effort to improve water quality in Mountain Creek, Walnut Creek, Village Creek and its tributaries. Some of these waterways are considered by the State as “concerned” for near nonattainment of the contract recreation use due to elevated bacteria concentrations or “impaired”. Failing OSSFs were identified as potential sources of pollution in the Joe Pool Lake and Village Creek-Lake Arlington Watershed Protection Plan. Funding will be available to repair or replace approximately 10 failing OSSFs within the watershed. As seen in programs for the Joe Pool Lake / Village Creek–Lake Arlington watershed, and separately for Lampasas River watershed:Verify that your property is located inside the eligible watershed area. Download and fill in the application, online or printed. Submit the application to the program manager (e.g. Trinity River Authority for one area, Texas A&M AgriLife Extension for another). If your application is accepted, they'll conduct a site visit to confirm system condition and eligibility. Funding decisions are made based on priority criteria; applicants receive grant funds to repair or replace their system. Programs typically run for specific periods (e.g. applications from Dec 2024 to Aug 2027), or until funds are exhausted Covers areas of Williamson County that lie within the Lampasas River watershed. Eligible homeowners there (meeting criteria) can apply for grants to repair/replace septic systems The Brazos River Authority (BRA) is instrumental in managing water resources across the Brazos River basin in Texas. Beyond its primary responsibilities, the BRA oversees several reservoirs and is engaged in numerous projects to enhance water supply, quality, and infrastructure. Key Reservoirs Managed by the BRA: Possum Kingdom Lake: Lake Granbury: Lake Limestone: Allens Creek Reservoir (Proposed): Notable Projects and Initiatives: East Williamson County Regional Water System (EWCRWS) Expansion: Morris Sheppard Dam – Possum Kingdom Lake: Environmental and Special Projects: Through the management of these reservoirs and the execution of various projects, the BRA continues to play a pivotal role in ensuring sustainable water resources, environmental stewardship, and infrastructure development within the Brazos River basin. The Brazos River Authority (BRA) is a governmental agency responsible for managing the water resources of the Brazos River basin, which spans 42,000 square miles across Texas. The Brazos River is the longest river entirely within Texas, flowing 840 miles from its headwaters in the Texas Panhandle to the Gulf of Mexico. The BRA was created in 1929 as the first river authority in the United States to develop, manage, and protect water resources within a single river basin. The Brazos River Authority (BRA) plays a vital role in water supply management, flood control, water quality, and conservation within the Brazos River Basin. It ensures reliable water resources for cities, businesses, agriculture, and recreation while protecting water quality and ecosystems. Permit Applications: Reviews and issues permits for new installations, repairs, upgrades, or replacements of septic systems. All applications are now processed exclusively through the My Government Online portal; email or paper submissions are no longer accepted Site Evaluation & Design Review: Requires submission of soil reports and system design plans as part of planning materials, which must adhere to state and county-specific standards Inspections: Coordinates required inspections during key construction phases (e.g. tank, distribution media, final), scheduled by licensed installers via the County Engineer’s office Enforcement & Complaints: Handles complaints, investigates system malfunctions, issues notices of violation, and can take legal action if needed License Issuance & Maintenance Oversight: Issues "License to Operate" for systems before use. For aerobic systems, tracks required maintenance contracts and license renewals every two years There is no single county-wide Regional Water District in Williamson County analogous to the Parker County Regional Water District structure. Instead, Williamson County’s water and wastewater services rely on a variety of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and other local services—but no overarching Regional Water District acts as a unifying authorized agent for the entire county. There are 4 treatment component steps of an Aerobic Septic System. The system introduces air into the wastewater treatment process to promote the growth of aerobic bacteria, which break down organic matter more effectively than anaerobic bacteria used in conventional systems Any aerobic treatment unit (ATU) must be maintained by a TCEQ‑registered and County‑approved maintenance provider. Homeowners are not allowed to self-maintain these systems unless authorized as maintenance providers. Williamson CountyWilliamson County Maintenance providers must perform regular system servicing (per manufacturer and system design specifications) and submit maintenance reports to the County Engineer’s Office. Williamson CountyWilliamson County Homeowners with an aerobic system who are self-maintaining under a homeowner’s contract must submit a Routine Maintenance Affidavit (notarized and filed in County Records) and upload it via the MyGovernmentOnline portal as part of the OSSF application. Failure to do so voids the authorization. TCEQ+13Williamson County+13Destiny Hosted+13 Upon installation, systems meeting secondary treatment criteria receive an initial License to Operate valid for two years. To renew, the homeowner must: Submit a new maintenance contract (or valid homeowner-contract affidavit), Provide current maintenance inspection reports, and Pay the applicable renewal fees. Noncompliance (e.g. unresolved violations) can result in license cancellation within 10 days—without re‑licensing until corrective action, documentation of compliance, and fees are submitted. Williamson County+3Destiny Hosted+3Williamson County+3 All operations must align with TCEQ Rule 30 TAC Chapter 285 as well as Williamson County’s local OSSF Order, which may include additional or more stringent requirements. Williamson County+10Destiny Hosted+10TCEQ+10 Complaints (e.g. system failure, exposure) must be addressed and resolved by the authorized agent. Enforcement including violation notices or court actions may follow. TCEQ Ensure active maintenance contracts or self-maintenance affidavits. Schedule or allow inspections by the County. Renew licenses every two years with required documentation. File signed and notarized routine maintenance affidavit for aerobic systems with County Deeds & Records, then upload via the portal. TCEQ+4Destiny Hosted+4Williamson County+4Williamson County File inspection reports on time to maintain operational compliance. Provide replacement or repair services when needed. Operate under TCEQ registration and on the county-maintained provider list. TCEQ If your property is inside the City of Austin's limits (or within its Water OSSF jurisdiction), then Austin Water Utility is the governing authority for septic systems—including permits and inspections. Williamson County's OSSF authority applies only outside those areas. Here's what you need to know: Austin Water Utility is the authorized agent for On‑Site Sewage Facilities (OSSF) within the City of Austin jurisdiction, including annexed areas and properties with access to certain water bodies (e.g. Lake Austin frontage), even if outside city limits Williamson County+10Austin Texas+10TCEQ+10. Williamson County does not regulate OSSF systems within these areas—Austin Water handles them entirely. Here’s what you’ll need when dealing with septic systems inside Austin’s jurisdiction: Permit Application Applications are submitted through the AB+C Portal, typically by a licensed designer, but homeowners may submit if authorized Austin Texas. Required materials include site/soil evaluations and signed planning documents. Design Review & Authorization to Construct A professional engineer or registered sanitarian must prepare standard/non‑standard system plans. Permit approval is contingent on site evaluation, proper setbacks, floodplain status, aquifer recharge zoning, etc. Williamson County+13Austin Texas+13Williamson County+13Williamson CountyLCRA+7TCEQ+7Williamson County+7. Mandatory Inspections During Construction Austin Water conducts phase inspections—e.g. tank, drainfield, final construction—scheduled by the installer or designer. A written certification from the designer that the installation follows approved plans is required prior to system operation Austin Texas+1Williamson County+1Williamson CountyMunicode Library. License to Operate / Notice of Approval Once all inspections pass, Austin Water issues a formal notice of approval (equivalent to a License to Operate). The system may not be used until this final approval is granted Williamson County+5Municode Library+5Williamson County+5Austin TexasTCEQ+3Williamson County+3LCRA+3. If your property lies within Austin Water's jurisdiction, all septic approvals and inspections must go through the City of Austin's OSSF program, not the county. Use the City’s OSSF jurisdictional map or contact Austin Water to confirm whether your address is governed by the city TCEQ+7Austin Texas+7TCEQ+7Williamson CountyAustin TexasNew Tools+1Williamson County+1Municode LibraryWilliamson County+3TCEQ+3Williamson County+3Williamson County. The City of Austin prohibits septic system installations in some cases; there may be no OSSF service allowed, and systems may not be permitted at all depending on density, availability of sewer, or water body proximity. The Williamson County Department of Infrastructure / Environmental Services acts as the TCEQ-authorized agent for managing On-Site Sewage Facilities (OSSFs) in county areas outside of the City of Austin’s jurisdiction. Williamson County+12Williamson County+12Destiny Hosted+12 Their regulatory authority is based on a local county order that adopts all relevant state rules (30 TAC Chapter 285), with the option to impose stricter local requirements. TCEQ+2Destiny Hosted+2Williamson County+2 Must apply online through MyGovernmentOnline; paper or email applications are no longer accepted. Austin Texas+5Williamson County+5co.freestone.tx.us+5 Required upfront: property owner authorization if applicant is not the owner. Williamson County+2Williamson County+2Destiny Hosted+2 Permit types and fees include: Standard system: ~$510 Non-standard engineered system: ~$610 Aerobic OSSF: ~$710 Commercial systems: higher fees. burnetcountytexas.org+10Williamson County+10Williamson County+10Williamson County Must submit a site evaluation by a licensed TCEQ Site Evaluator or Professional Engineer. The property must have a minimum of two profile holes (24" wide, 5' deep) open for county inspection. Williamson County+3Williamson County+3TCEQ+3 System designs should be prepared by a professional engineer or registered sanitarian, especially for non-standard or aerobic systems. Standard gravity systems may be designed by homeowners or installers except in floodplain or recharge zones. Williamson County+1New Tools+1 Review may take up to 30 days; you’ll receive notice of approval or revision requests. Williamson County Written Authorization to Construct must be issued before construction starts. Allows either a licensed installer or homeowner (for single-family dwellings) to build the system. Williamson County+12Williamson County+12TCEQ+12 County inspectors conduct critical-phase inspections (tank, drain field, final). The installer or homeowner must request inspections through MyGovernmentOnline, with fee-based re-inspections if needed. Williamson County A License to Operate (Notice of Approval) is issued only after final inspection passes. The system must not be used before receiving this license. Williamson County+1Destiny Hosted+1 Aerobic systems require a valid maintenance contract with a TCEQ-registered provider, or a homeowner’s affidavit if self-maintaining. Maintenance providers must submit annual inspection reports on system performance, sludge levels, and spray areas (if applicable). TCEQ+4Williamson County+4Destiny Hosted+4 The initial License to Operate is valid for two years, followed by license renewal—requires current maintenance contract or affidavit, inspection report, and payment of renewal fee. Williamson CountyDestiny Hosted If a system is failing or violates requirements and is not corrected within 10 days, its license may be revoked until compliance is achieved. Destiny Hosted Within city limits, each city’s authority (e.g. Cedar Park Public Works, Georgetown Utilities, Leander Utilities, Round Rock Utilities) is the designated OSSF permitting authority. Williamson County’s OSSF program does not apply inside city limits, even if the county serves as the authorized agent in unincorporated areas. Comal County Engineering Office+11Williamson County+11Destiny Hosted+11 Although procedures vary by municipality, all city-level OSSF permit programs are governed by the Texas Administrative Code (30 TAC Chapter 285), and you can expect to need the following: Submitted through the city’s designated portal or office (not Williamson County’s MyGovernmentOnline system). Applicants must complete a standard application and pay applicable fees based on system type and whether it's a replacement, alteration, or new build. New Tools+1TCEQ+1Williamson County+1Williamson County+1 Performed by a TCEQ‑licensed site evaluator or professional engineer. Report must include soil profile holes, texture analysis, setbacks, well locations, floodplain data, and any recharge zone features. Williamson County+15New Tools+15TCEQ+15 REQUIREMENTS (as per §285.4 and §285.5 in TAC): Standard gravity systems: often designed by installer or homeowner. Non-standard or aerobic systems: must be prepared by a professional engineer. Documents normally include site plan, topographic & floodplain mapping, drainage layout, and system schematic. TCEQ+2New Tools+2TCEQ+2 A formal permit issued by the city before any construction begins. Typically includes a job identification sign or notice to post at the site. Liberty Hill+3Municode Library+3Comal County Engineering Office+3 Required inspections: tank installation, distribution system, and final inspection. Normally conducted by city inspectors or designated representatives working for the city. System must conform to approved plans. Final approval is issued after all inspections pass. Operation of the system is not permitted before receiving the written Notice of Approval. Here are the On‑Site Sewage Facility (OSSF) permit application requirements for unincorporated areas of Williamson County, Texas (i.e., outside city limits), based on the County’s Environmental Services and Infrastructure program: A permit is required for any new, altered, repaired, or expanded septic system before work begins, regardless of acreage—routine tank pumping does not require a permit Comal County Engineer's Office+10Williamson County, TX+10Williamson County, TX+10Washington County, TX+1Burleson County+1. All applications are submitted online via MyGovernmentOnline (MGO) at mygovernmentonline.org Williamson County, TX. If the applicant is not the property owner, a signed authorization letter is required. Once deemed administratively complete, the county issues an invoice. Payment triggers issuance of a job-site identification tag emailed to the applicant, which must be posted at the property—but this does not authorize construction Williamson County, TX+5Williamson County, TX+5TCEQ+5. The application is valid for one year from the date of purchase. A site evaluation report must be conducted by a TCEQ‑licensed Site Evaluator or Professional Engineer, including: Topography, subsoil texture/depth, restrictive layers, groundwater, wells, flood hazards, and required setback distances; A minimum of two soil excavation pits (24 in wide, 5 ft deep or to bedrock) must be dug at opposite ends of the proposed drainfield and left open for County inspection Williamson County, TX+3Williamson County, TX+3TCEQ+3. Design plans must be prepared by a Professional Engineer or Registered Sanitarium, consistent with the soils report and TCEQ Chapter 285. Standard gravity or evapotranspiration systems may be designed by homeowners or licensed installers, unless located in a floodplain or recharge zone. The design must include details of tanks, drain field layout, piping, cleanouts, valves, and a scaled site plan showing setbacks from property lines, water sources, structures, etc. Williamson County, TX+11Williamson County, TX+11TCEQ+11. Additional documentation may include legal lot determinations, water pollution abatement plans, or Certificate of Compliance permits. Aerobic systems require a filed aerobic affidavit and service policy before administrative approval Williamson County, TX. After submission and payment, Williamson County staff reviews the application for compliance. Upon approval, the county issues an Authorization to Construct—construction must not begin before this is received. Licensed installers schedule and undergo inspections at critical phases, including a final inspection before the system is covered. After passing the final inspection, the county issues a License to Operate Williamson County, TX+6Williamson County, TX+6MenuMaker+6. Systems located within the 100‑year floodplain or recharge zones may require additional review or be ineligible for simple gravity or ET systems—more advanced designs may be needed. Properties within extra-territorial jurisdictions (ETJ) are still under the County’s OSSF program—design and plat requirements still apply, and OSSF approvals may be required when a subdivision is planned TCEQ+2MenuMaker+2Williamson County, TX+2. Here’s a clear breakdown of renewal and reporting requirements for your septic (OSSF) system in unincorporated Williamson County, Texas: License Validity: A License to Operate is issued after final system inspection. It’s valid for two years for systems requiring secondary (aerobic) treatment MenuMaker+9MenuMaker+9Williamson County, TX+9. Renewal Timing: Before expiry, you must: Submit a License Renewal / Transfer form Pay the renewal fee per the County’s current schedule (contact county for updates) MenuMaker+4Williamson County, TX+4Williamson County, TX+4. Renewal Conditions: To qualify: The system must be functioning properly A current maintenance contract or allowable homeowner maintenance arrangement must be in effect Williamson County, TX+9MenuMaker+9TCEQ+9Williamson County, TX+4Williamson County, TX+4TCEQ+4. Aerobic Treatment Units (ATUs): Require a routine maintenance contract, which must be submitted via a notarized and County‑filed affidavit Williamson County, TX. The affidavit must be submitted with your online application via MyGovernmentOnline or filed upon renewal TCEQ+7Williamson County, TX+7Williamson County, TX+7. Maintenance Inspections: Maintenance providers (or certified homeowners) must conduct routine inspections and submit maintenance/inspection reports to the County Engineer’s office at least every two years, aligned with renewal cycle Williamson County, TX+3Williamson County, TX+3MenuMaker+3. System Types That Trigger Reporting: Only aerobic systems (ATUs) and systems requiring secondary treatment mandate contracts and reporting. Conventional septic systems and basic ET systems do not require routine contracts or inspection reporting under TCEQ §285.39 MenuMaker+1Williamson County, TX+1Texas New Tools. Here are the special considerations for septic (OSSF) systems located within city limits or within the extraterritorial jurisdiction (ETJ) of municipalities in Williamson County, TX—regions where Williamson County still regulates systems, but additional requirements apply: Cities like Georgetown and Taylor do not issue septic permits inside their city limits but systems located within their ETJs or annexation agreement areas are still regulated by Williamson County Williamson County+13huttotx.gov+13Williamson County, TX+13. If your property is inside a municipality’s actual limits or ETJ, additional platting requirements may apply—in particular, newly created lots under five acres may require formal platting through the city or county before an OSSF permit can be approved Williamson County, TX+1Williamson County, TX+1. Properties within city limits or ETJs, especially those being subdivided or newly developed, may require platting or replatting under city or county subdivision regulations. This applies even if the tract is under five acres Williamson County, TX+5Williamson County, TX+5Williamson County, TX+5. If your site falls within the Edwards Aquifer Recharge Zone, Williamson County can’t issue an Authorization to Construct until you hold an approved Aquifer Protection Plan with the TCEQ. This affects both residential and commercial systems Austin Texas+2Williamson County, TX+2Williamson County, TX+2. Commercial or multi-use systems located inside city limits or ETJs may entail extra requirements: Submission of a Commercial Water Use Questionnaire Potentially separate plumbing and higher review requirements Delayed approvals if the site is in a recharge zone or high-impact area Williamson County, TX+13Williamson County, TX+13Williamson County, TX+13. Even inside city limits (where county regulation still applies), the application must be submitted via Williamson County’s MyGovernmentOnline portal, where design professionals, builders, and owners coordinate digitally huttotx.gov+2Williamson County, TX+2Williamson County, TX+2. Designer contact details, notifications, and document uploads are managed through the county portal—even if the property is technically in the city’s ETJ Williamson County, TXWilliamson County, TX. Williamson County has adopted its own OSSF Order, which incorporates and may be more stringent than TCEQ minimum standards under 30 TAC Chapter 285 Williamson County, TX+6MenuMaker+6Williamson County, TX+6. Whether inside city limits or ETJ, county-specific definitions, licensing, evaluation, and enforcement procedures remain applicable—even alongside city subdivision rules. If your septic (OSSF) system is located outside any city limits and beyond city ETJs—in unincorporated Williamson County—here’s what you need to know: Williamson County acts as the Authorized Agent (AA) for the TCEQ in unincorporated areas, enforcing county-specific rules that comply with or exceed minimum state (30 TAC Chapter 285) requirements Williamson County, TX+12Williamson County, TX+12TCEQ+12City of Round Rock+3MenuMaker+3TCEQ+3. Platting rules applicable within city ETJs do not apply when your property lies entirely outside those jurisdictions. There is no municipal platting requirement, even for tracts under 5 acres. If your property is within the Edwards Aquifer Recharge Zone, you must provide: A TCEQ‑approved Water Pollution Abatement Plan (WPAP). Mapping of recharge features and required setbacks shown on your plat/survey. A plat note stating: “No construction…until TCEQ has approved the WPAP in writing” for lots ≤5 acres Williamson County, TX+6City of Round Rock+6TCEQ+6. The county recommends a pre-construction planning meeting to discuss: Permitting, plumbing specifics, licensed professionals, irrigation reuse, industrial-strength wastes, and challenges like parking-area sewer protection MenuMaker+8Williamson County, TX+8Revize+8. The general process mirrors any county OSSF submission: Apply online via MyGovernmentOnline Submit site evaluation (two profile holes, soil details, topography, flood risk, wells, etc.) by a TCEQ‑licensed evaluator or P.E. Submit design plans (by a PE or Registered Sanitarian unless it's a straightforward gravity or ET system not in flood or recharge areas) Upload survey or deed, along with scaled site and design plans Submit supporting documentation (aerobic affidavit, WPAP, etc.) Receive Authorization to Construct before beginning installation Schedule inspections at critical phases & final approval before operation Williamson County, TX+11Williamson County, TX+11Williamson County, TX+11 Williamson County has adopted stricter rules than TCEQ minimums where necessary—particularly for setbacks, water reuse, and system design—through its official OSSF Order Comal County Engineer's Office+12MenuMaker+12TCEQ+12. The solids produced by the natural biological treatment process. Activated sludge has an abundance of beneficial microbes (“bugs”) and is used to bolster the aerobic treatment process. Williamson County Engineer’s Office, within the Infrastructure Department’s Environmental Services division, oversees permitting, inspections, complaint investigations, and enforcement of septic (OSSF) systems in unincorporated areas and extraterritorial jurisdictions (ETJs) of Williamson County Williamson County This office is formally recognized by the TCEQ as the authorized agent for administering OSSF regulations in accordance with state law (Texas Health & Safety Code Chapter 366 and TCEQ’s 30 TAC Chapter 285) Williamson County+9 The level of the surface of the water in a chamber or basin. A v-shaped opening usually found on one side of a weir. The v-notch provides a means of controlling flow into the weir and separating solids from the final effluent. Anything that isn’t liquid that enters the treatment system. Solids can be trash or sludge.State & Local Requirements
How Does Your Region Affect Your Septic System?
Considerations For Williamson County
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For Williamson County
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For Travis County
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For Bell County
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For City of Georgetown
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For City of Leander
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For City of Round Rock
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For City of Austin
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
Considerations For City of Cedar Park
How to apply
Does this program apply in Williamson County, Texas?
✅ Lampasas River Watershed Phase II (AgriLife program)
Key Responsibilities of the Brazos River Authority:
1. Water Supply Management
2. Flood Control and Drought Management
3. Water Quality Protection
4. Permitting and Water Rights
5. Recreational and Environmental Stewardship
Service Area of the Brazos River Authority
Governance of the Brazos River Authority
Conclusion
Maintenance & Operation Rules
Licensed Maintenance Required for Aerobic Systems
Routine Maintenance & Inspections
License to Operate & Renewal
Compliance Framework & Penalties
Homeowners:
Maintenance Providers:
🏛️ Regulatory Authority Inside City of Austin
📋 Permitting, Inspections & Approvals by Austin Water
Key Points to Take Away
Who Regulates OSSF in Unincorporated Williamson County?
Septic Permit & Approval Process
1. Permit Application
Site & Soil Evaluation
Design Planning & Review
Authorization to Construct
Inspections During Construction
License to Operate
Maintenance & Operation Standards
Who Is Responsible?
📝 Permit Application Requirements
1. Official Application Form
2. Site Evaluation/Soil Investigation
3. Planning Materials / System Design
4. Authorization to Construct
5. Phase Inspections
6. Notice of Approval / License to Operate
1. ✅ Permit Required
2. Application Submission Process
3. Site & Soil Evaluation
4. System Design & Supporting Documentation
5. Review, Inspections & Final Licensing
6. Floodplain & ETJ Considerations
🔄 License Renewal Requirements
🧾 Maintenance Contracts & Reporting
🏙️ 1. Jurisdiction & Applicability
📏 2. Platting & Lot Requirements
🌊 3. Edwards Aquifer Recharge Zone Considerations
🏢 4. Commercial or Mixed‑Use Systems
🛠️ 5. Same MyGovernmentOnline Process
🔍 6. Local (More Stringent) Rules Apply
⚙️ Primary Regulatory Framework
1. No City or ETJ Requirements
2. Edwards Aquifer Recharge Zone (EARZ)
3. Required Pre‑Application Meeting (Designer)
4. Standard Unincorporated Application Process
5. More Stringent Local Standards
