Texas Septic Regulations by County: 2026 Guide
Texas septic regulations under TCEQ Chapter 285 govern every OSSF in the state. Here's the county breakdown, aerobic rules, and Edwards Aquifer overlay.
Texas septic regulations are not one size fits all. The state rule — 30 Texas Administrative Code Chapter 285 — applies to every on-site septic facility (OSSF), but who enforces it depends on your county. About 40 counties are TCEQ Authorized Agents that handle permitting locally. The other 214 counties go through one of TCEQ's 16 regional offices. Over that sits the Edwards Aquifer Authority, which adds another layer for eight Hill Country counties, and 181 Groundwater Conservation Districts that touch well work on the same properties.
Here's the 2026 view of texas ossf regulations, what the tceq chapter 285 rules actually require, and how texas septic code 2026 updates (if any) could affect your project.
Texas Septic Regulations: The Core TCEQ Chapter 285 Framework
30 TAC Chapter 285 sets the minimum standards for every Texas OSSF:
- Permit required for every new and replacement OSSF install (with the 10-acre exemption)
- Site evaluation required — soil, setbacks, seasonal water table
- Design standards by system type (conventional, LPD, ATU, drip, etc.)
- Licensing requirements for Site Evaluators, Installers, Designers, Maintenance Providers, and Transporters
- Mandatory two-year maintenance contract for aerobic systems with 3x/year inspections
- Reporting requirements for emergency repairs (72-hour notice to TCEQ)
Authorized Agent Counties
About 40 counties and city-county health districts have formal TCEQ Authorized Agent status. The biggest include:
Harris, Dallas, Tarrant, Bexar, Travis, Williamson, Collin, Denton, Fort Bend, Montgomery, El Paso, Nueces, Galveston, Brazoria, Cameron, Hidalgo, Lubbock, Hays, Comal, Brazos, McLennan, Smith, Gregg, Potter, Randall, Jefferson, Grayson, Ellis, Kaufman, Johnson, Parker, Rockwall, and others.
If you're in one of those, your texas ossf regulations get enforced by the county environmental health department. Outside those counties, your nearest TCEQ regional office is the permitting authority.
The 10-Acre Exemption
Chapter 285 exempts single-family dwellings on properties 10 acres or larger from permitting, provided no effluent crosses the property line. It does not exempt the design from standards; it just removes the permit requirement. Sale of the property may trigger retroactive permitting, so use the exemption cautiously.
Edwards Aquifer Authority Overlay
The EAA has supplemental jurisdiction in eight counties — Bexar, Comal, Hays, Travis, Williamson, Uvalde, Medina, and Kinney. Within the recharge and contributing zones, new OSSF installs face enhanced setback, casing, and treatment requirements. Expect an additional 2–4 weeks of review and $200–$500 in EAA fees.
Key Differences From Other State Septic Codes
- Aerobic maintenance mandate. Texas is unusual in requiring three inspections per year by a licensed MP for the first two years on every aerobic system. Stricter than most states.
- 10-acre exemption. Few states have an exemption this clean.
- Edwards Aquifer Authority. No other state has a comparable aquifer-specific septic overlay.
- Transporter licensing. Texas requires pumpers to hold a TCEQ Transporter registration and dispose at permitted facilities.
2026 Regulatory Watch
As of early 2026, the texas septic code 2026 context includes:
- Continued TCEQ rulemaking on ATU discharge standards and maintenance provider training
- Implementation of EPA's 2024 PFAS drinking water rule (affects private well owners near septic, not septic itself)
- Groundwater Conservation District reviews in expanding urban counties
No major Chapter 285 overhaul is scheduled, but localized rule updates happen frequently. Confirm with your county or TCEQ regional office before designing a new system. For the full permit process walk-through, see our Texas septic permit guide and Texas septic systems guide.
Frequently Asked Questions
Who regulates Texas septic systems?
TCEQ — the Texas Commission on Environmental Quality — via 30 TAC Chapter 285. In 40+ counties, enforcement is delegated to the county as an Authorized Agent. The rest go through TCEQ regional offices.
Do Texas septic regulations require aerobic systems?
Not categorically. But clay soils, shallow water tables, and Edwards Aquifer zones effectively require aerobic in most of Central and East Texas. Conventional is still allowed where soil and site conditions meet standards.
Has Texas updated its septic code recently?
Chapter 285 gets occasional amendments, and TCEQ posts rulemaking updates regularly. Major statewide rewrites are infrequent; localized rule changes happen often.
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