Owning an aerobic septic system in Texas comes with a paperwork requirement that surprises many new owners: a maintenance contract. It is not a sales gimmick. It is a state rule, and your county may add its own conditions on top.
This guide covers the Texas aerobic septic maintenance contract rules in plain language. You will learn who needs a contract, what a licensed provider must do, how reporting works, what you are still responsible for, and when you can maintain the system yourself.
A quick note before we start. Rules change and counties interpret them differently. Treat this article as a map, and confirm the details for your property with your permitting office.
Why Texas requires maintenance contracts
An aerobic treatment unit is a small wastewater plant. It has an air pump, pumps for moving water, a timer, a disinfection step and often an alarm. Parts wear out. Filters clog. Chlorine feeders run empty. If nobody checks, a system can quietly stop treating water and still look fine from the house.
Untreated or poorly treated water that reaches a lawn is a public health problem. In the Hill Country it is also an environmental one, because of thin soils, fractured limestone and the Edwards Aquifer recharge areas. A maintenance contract puts a trained set of eyes on the system on a regular schedule, so problems get caught before they reach the surface or the groundwater.
The Texas Commission on Environmental Quality (TCEQ) writes the statewide rules for on-site sewage facilities in 30 TAC Chapter 285. Local counties and cities that act as authorized agents enforce them, and they can set stricter rules.
Who needs a contract, and for how long
Under the state rules, aerobic systems and other systems that rely on secondary treatment need a maintenance contract with a licensed maintenance provider. The contract is not optional for the first part of the system’s life.
Hays County states that every new on-site sewage system requiring maintenance needs an initial two-year contract with a licensed provider. Applicants for aerobic systems in Hays County submit a maintenance affidavit and a copy of that two-year contract along with the permit application. Homeowners may maintain their own system only after that initial period, according to the county.
Other counties write their own versions of the same idea. Some county forms in Texas also describe a continuous contract during the first two years, followed by a choice for single-family homes: sign a new contract within 30 days or maintain the system personally. Because wording differs from place to place, always read the affidavit and permit conditions you receive.
Two practical points follow from this:
- If you are building a new home in Hays County, the contract is part of the permit packet, not an afterthought.
- If you are buying a home with an existing aerobic system, ask whether a contract is in force and who the provider is. More on that in our guide to buying a home with septic in the Hill Country.
What “licensed provider” means
The contract has to be with a licensed maintenance provider. TCEQ no longer registers maintenance companies. Instead, it licenses individuals.
According to TCEQ, a person can qualify by holding certain licenses (such as an Installer Class II or a Class C or higher wastewater operator license) or by having several years of experience as a registered maintenance provider or technician. They also have to take approved courses, including a basic maintenance provider course and an advanced aerobic systems course, and pass an exam.
Employees who do the field work under a licensed provider must be registered maintenance technicians, working under the provider’s direct supervision. The contract itself must name the individual who will perform the work.
You can ask any provider for their license number and verify it with TCEQ or with your county, which keeps a list of providers. Hays County’s documents page lists OSSF maintenance providers, for example. A company can legitimately subcontract or have staff, but the licensed individual stays responsible under the contract.
What the contract must say
TCEQ outlines what a contract has to include. In general, it must:
- Name the person performing the work
- List the items it covers
- Set a response time for owner complaints
- State who maintains the disinfection unit and supplies the chlorine
The contract also sets how often routine maintenance happens, and how often the system is tested and reported. The provider decides what it needs within the state minimums, and your county may set more.
Read the contract carefully before you sign. Look at what is included and what is not. Some contracts cover labor only, and parts are billed separately. Some include chlorine tablets, and others do not. Pump-outs, major repairs and replacement of pumps or air compressors are often outside the base price. Ask how emergency calls are handled and what the stated response time really means in writing.
Be cautious about any contract that is vague about these points. If a provider will not put the response time or the scope in writing, that tells you something.
The inspection and reporting schedule
TCEQ requires the maintenance provider to send a report to both the owner and the permitting authority at least once every four months. If the system has an electronic monitor that alerts the provider to failures and tracks disinfection levels, the interval can stretch to once every six months. Reports are due within 14 days of the test.
At each visit, the provider is supposed to:
- Tag or otherwise mark the system to show the visit
- Inspect every component and note whether it works
- Test the system as required by the rules
- Record any owner complaints and any monitor alerts that came in
- Confirm that any alert or monitoring equipment is working
A typical visit includes checking the air pump and diffuser, looking at the aeration chamber’s color and smell, measuring the treated water, checking the chlorine feeder, testing pumps and float switches, and running the spray heads or drip zones. The provider also checks that the control panel and alarm work.
If something is not working, the owner must repair it. That is a point many people miss. The contract covers the inspections and the reporting. It does not mean the provider pays for a broken pump.
What stays on your plate
Even with a contract, you play a role. Daily and weekly attention helps the system last.
Look at the control panel when you walk by. A steady light usually means normal operation, and a flashing light or buzzer means a problem. Our post on what to do when your septic alarm is going off covers the first steps.
Watch the yard. Soggy areas, odors, or spray heads that are not turning can all signal trouble.
Use the right chlorine. TCEQ says the feeder should use calcium hypochlorite tablets certified for wastewater disinfection. Swimming pool tablets are made from a different chemical, dissolve more slowly and should never go in the feeder. If your contract says the provider supplies chlorine, let them handle it. If you buy it yourself, check the label.
Protect the system from what goes down the drain. Bleach in large amounts, harsh drain cleaners, wipes, grease and water softener backwash can upset the bacteria or clog the equipment. A short list of habits is in our homeowner septic maintenance checklist.
Can you maintain your own system?
TCEQ says that two years after installation, homeowners may perform maintenance on certain systems, including aerobic units with spray or drip disposal. The statewide rule sets a floor, though. TCEQ warns that local permitting authorities may require training or may not allow homeowner maintenance at all.
In Hays County, the county states that homeowners may maintain their own system only after the initial two-year contract ends. Ask Development Services what documents or training you need before you drop a contract.
Think hard about whether it makes sense. Self-maintenance means you need the knowledge to test the disinfection level, inspect pumps, interpret alarms and keep records. You will also need to deal with any report requirement from the county. For some owners, this works well. For many, a professional visit a few times a year costs less than a single failed pump discovered late.
If you do take over, keep a log with dates, observations and what you did. A written record helps with county questions and with future buyers.
What it costs
Maintenance contract prices vary by provider, system size, equipment and what is included. Prices vary widely with the provider, the equipment and what the contract includes, such as chlorine, monitoring or extra visits. Parts, pumping and repairs are often billed on top. We do not quote figures here, so get written quotes and compare scope as well as price.
Compared with the cost of replacing a spray field or a pump tank, a contract is a modest expense. For a bigger picture of what a new aerobic system costs in the area, see our aerobic vs conventional septic comparison.
What happens if you skip the contract
Skipping a required contract can lead to problems. The county can issue notices or violations. A system that is not tracked may fail without anyone noticing. When you sell, a lender or buyer may ask for proof of service, and missing records can slow or derail a deal.
If your contract lapsed by accident, call your county and a licensed provider promptly. It is far better to restore coverage voluntarily than to wait for a complaint or a failed inspection.
Finding the right provider
Good questions to ask before you sign:
- Who is the licensed individual and what is their license number?
- What visits are included, and how often do you send reports to the county?
- Is chlorine included?
- What is the written response time for complaints?
- What repairs and parts are billed separately?
- Do you work with monitoring panels or remote alerts?
Our aerobic septic maintenance service page explains how we approach routine visits, and our aerobic septic repair page covers what happens when a component fails. If you are in or near Dripping Springs, where Hays County rules apply to most rural lots, we can walk through your permit paperwork with you.
Questions about a contract for a new or existing system? Request a free estimate and we will talk through your system, your county and what coverage makes sense.
- aerobic septic
- maintenance contract
- TCEQ
- Texas OSSF rules
- Hays County