Texas septic rules, in plain English
In Texas, a septic system is officially called an On-Site Sewage Facility, or OSSF, and the state agency in charge is the TCEQ. But here's the thing most homeowners don't realize: you'll almost never deal with the state directly.
In Texas, a septic system is officially called an On-Site Sewage Facility, or OSSF, and the state agency in charge is the TCEQ. But here's the thing most homeowners don't realize: you'll almost never deal with the state directly. Texas hands the real work to your local 'authorized agent' — usually your county or a public health district — who issues your permit, checks your soil, and signs off on the install. You need a permit before you install, repair, or significantly change a system, and the person doing the work has to be TCEQ-licensed. You can look any installer or maintenance company up in TCEQ's free online license database. The biggest quirk in Texas is the aerobic system, or ATU. Lots of Texas land has thick clay or shallow rock that won't absorb wastewater, so the fix is an aerobic unit that sprays treated water across the yard. State law requires those to be under a maintenance contract for life, with a licensed pro inspecting three times a year. Texas does NOT require an inspection when you sell a house — but you do have to disclose the septic system to the buyer, and lenders often demand an inspection anyway.
What this means for you
The rules change depending on where you are in the process.
Texas won't force an inspection at closing, but get one anyway — it's the only way to know if you're inheriting a failing drainfield or a costly aerobic unit. Ask whether it's a conventional or aerobic (ATU) system. If it's aerobic, budget $150-$600/year for the required maintenance contract and confirm the contract transfers. Get the original permit and the last few maintenance reports from the seller.
You must disclose the system on the Seller's Disclosure Notice and attach the on-site sewer facility form (TXR-1407) describing what you have and its condition. You're not legally required to pump or inspect before listing, but a clean recent inspection removes a major buyer objection — and FHA/VA appraisers will flag any surface sewage or odors, triggering a required inspection.
Start with your county authorized agent, not the state. You'll need a site/soil evaluation by a licensed site evaluator and planning materials before a permit is issued. On tight lots, clay soils, or near water, expect to be required to install an aerobic system with spray distribution. In the Edwards Aquifer Recharge Zone you'll need at least one acre per home and engineer-sealed plans.
Conventional tank? Pump it every 3-5 years and keep the records. Aerobic unit? You're legally required to keep a maintenance contract with a TCEQ-licensed provider and let them inspect three times a year — this isn't optional in Texas. Don't drive over the drainfield or spray area, and don't plant trees on it.
Setback rules get strict. Tanks must sit well back from wells (50-100 ft) and water features. Over the Edwards Aquifer Recharge Zone (around San Antonio, Austin, and the Hill Country), you need a minimum one-acre lot per home, a 50-ft setback from recharge features, and engineer- or sanitarian-sealed plans — designed to keep wastewater out of the drinking-water aquifer.
The rules, explained
Each rule, what it actually requires, and the reason it exists.
Permit before you dig
You must get a permit from your local authorized agent before installing, altering, or repairing an OSSF, and only a TCEQ-licensed installer can do the work.
It guarantees the system is sized and placed for your actual soil and lot, so it doesn't back up into your house or surface raw sewage into the neighborhood.
Licensed people only
Installers, maintenance providers, site evaluators, and designated representatives all must hold a current TCEQ license, which you can verify in the free public database.
Septic mistakes are expensive and can contaminate drinking water. Licensing means the person was trained and is accountable to the state if they cut corners.
Aerobic systems need a lifetime maintenance contract
If you have an aerobic treatment unit (ATU), state law requires a maintenance contract with a licensed provider and inspections every 4 months — for as long as the system exists.
Aerobic units use pumps, blowers, and chlorine and spray treated effluent on the surface. If they fail unnoticed, partially-treated sewage sprays across the yard, so the law forces regular professional checks.
Setbacks from wells and water
Tanks and drainfields must keep minimum distances from property lines (about 5 ft), water wells (50-100 ft), and water features.
Distance and soil filter out bacteria before wastewater can reach a well or stream, protecting your own and your neighbors' drinking water.
Edwards Aquifer special rules
Over the Edwards Aquifer Recharge Zone you need at least one acre per home, a 50-ft setback from recharge features, and plans sealed by an engineer or sanitarian.
The recharge zone is where surface water flows straight down into the aquifer that supplies San Antonio and much of Central Texas — so contamination here is nearly impossible to undo.
Disclose at sale (but no mandatory inspection)
Texas doesn't require a septic inspection to sell a home, but the seller must disclose the system and its condition on the Seller's Disclosure Notice.
It shifts the burden to honesty and buyer due diligence rather than a state checkpoint, so buyers are expected to inspect on their own.
The letter of the law
The official statutes and licensing details behind the plain-English summary above.
Texas regulates septic systems, formally called On-Site Sewage Facilities (OSSFs), through the Texas Commission on Environmental Quality (TCEQ) under its OSSF Program. The governing law is Texas Health and Safety Code Chapter 366, implemented through the technical rules in 30 Texas Administrative Code (TAC) Chapter 285. With more than 2.6 million systems serving roughly a fifth of new homes, Texas has one of the largest septic populations in the nation. Most day-to-day permitting and inspection is handled locally: TCEQ delegates authority to roughly 300 county, city, and district 'authorized agents' who issue permits, evaluate soils, and enforce setbacks. Anyone who installs, maintains, or evaluates a system must hold a TCEQ occupational license, searchable through TCEQ's public license database. A defining feature of the Texas program is the heavy reliance on aerobic treatment units (ATUs) with spray fields, common because clay and shallow-bedrock soils across much of the state defeat conventional drainfields. ATUs carry a mandatory, lifetime maintenance contract with inspections three times a year. Sensitive zones like the Edwards Aquifer Recharge Zone carry stricter lot-size and setback rules under 30 TAC 285.40 and Chapter 213.
Texas Health and Safety Code, Chapter 366 (On-Site Sewage Disposal Systems)
The enabling statute that gives TCEQ authority over OSSFs, defines on-site sewage disposal systems, and authorizes counties, municipalities, and districts to act as local 'authorized agents' that issue permits and enforce the rules.
Source →30 TAC Chapter 285 (On-Site Sewage Facilities)
The core administrative rules: minimum technical standards for design, planning materials, construction, installation, setbacks, soil/site evaluation, permitting, the authorized-agent program, and mandatory aerobic maintenance contracts.
Source →30 TAC 285.40 / Chapter 213 (Edwards Aquifer Recharge Zone)
Special requirements for OSSFs over the Edwards Aquifer Recharge Zone: minimum 1-acre lots per single-family dwelling, 50-ft setback from recharge features, and planning materials sealed by a professional engineer or sanitarian.
Source →TREC/TXR Seller's Disclosure (On-Site Sewer Facility, TXR-1407)
Texas does not require a septic inspection at sale, but a residential seller must disclose the existence and known condition of any OSSF on the standard Seller's Disclosure Notice, with the supplemental on-site sewer facility form attached.
Source →Frequently asked questions
Do I need a permit for a new septic system in Texas?
Yes. You must obtain a permit from your local authorized agent (usually your county or a public health district) before installing, repairing, or altering an OSSF, and the work must be done by a TCEQ-licensed installer.
Does Texas require a septic inspection when I sell my house?
No. There is no statewide point-of-sale inspection requirement. However, you must disclose the system on the Seller's Disclosure Notice, and lenders (especially FHA/VA) often require an inspection as a condition of the loan.
How often do I have to pump my septic tank in Texas?
There's no fixed legal interval for conventional tanks — TCEQ recommends every 3-5 years depending on use. Aerobic units are different: they require professional inspection three times a year under a maintenance contract.
Why are aerobic (spray) systems so common in Texas?
Much of Texas has heavy clay or shallow limestone that won't absorb wastewater fast enough for a conventional drainfield. Aerobic treatment units treat sewage more thoroughly and spray the cleaned water on the surface, which works where soil percolation fails.
What is an 'authorized agent'?
It's the local government — a county, city, river authority, or district — that TCEQ has delegated permitting and inspection authority to. They're who you actually apply to and deal with for your septic system, not the state directly.
How do I check if my septic contractor is licensed?
Use TCEQ's free public license search at tceq.texas.gov. Enter the company or person's name to confirm they hold a current OSSF installer or maintenance license.
What's special about the Edwards Aquifer area?
If your property is over the Edwards Aquifer Recharge Zone (around San Antonio, Austin, and the Hill Country), you face stricter rules: minimum one-acre lots per home, a 50-foot setback from recharge features, and planning materials sealed by a professional engineer or sanitarian.