Is a maintenance contract really required for an aerobic septic system in Texas?

Yes. Under Texas Health & Safety Code 366.0515 and TCEQ rules in 30 TAC Chapter 285, every aerobic treatment unit must have a continuous maintenance contract with a TCEQ-licensed provider for the life of the system. It's a legal requirement, not a recommendation, and it transfers to new owners when the home is sold.

How often does an aerobic system have to be inspected in Texas?

At least once every four months — three times per year — by a licensed maintenance provider who then reports to your county. If your system has TCEQ-approved electronic monitoring, the required inspection interval can drop to once every six months.

How much does an aerobic septic maintenance contract cost?

Most Texas contracts run $200 to $500 per year, with full-service plans up to about $600. Basic plans cover the required inspections, testing, disinfection checks, and county reports. Chlorine refills, tank pumping, and major part replacement are often billed separately.

What happens if I let the contract lapse?

You're out of compliance immediately, since TCEQ requires continuous coverage. Counties enforce this, and penalties for ongoing maintenance-contract violations have been reported as high as $100 per day. If you switch providers, sign the new contract before the old one ends so there's no gap.

Does the maintenance contract include pumping the tank?

Usually not. A standard contract covers inspections, testing, and reporting — not pumping. Aerobic tanks still accumulate solids and need periodic pumping on a separate schedule. Some premium plans bundle an annual pump-out, so check the line items.

Can I maintain my own aerobic system instead of paying a provider?

Only in limited cases. TCEQ allows homeowner self-maintenance applications after the first two years, but your county permitting authority must approve it, and you'd still owe the same inspections and reports. Many Central Texas counties don't permit homeowner self-maintenance at all.

Aerobic (ATU) Septic Maintenance Contracts Explained

What an aerobic treatment unit (ATU) actually is

An aerobic treatment unit is a septic system that pumps air into the treatment tank. That oxygen feeds bacteria that break down waste far more aggressively than a conventional system does. The result is cleaner effluent — clean enough that most ATUs disperse it through spray heads onto the lawn or through drip lines, rather than burying it in a gravel drainfield.

That extra performance comes from moving parts: an air compressor (the aerator), a pump, control floats, an alarm, and a disinfection step (usually chlorine tablets or a UV unit) before the water is sprayed. Conventional systems are mostly passive — a tank and a drainfield with gravity doing the work. An ATU is closer to a small wastewater plant in your yard, and that's exactly why the state treats it differently. For a side-by-side breakdown, see our guide on aerobic-vs-conventional-septic.

Why the contract is mandatory in Texas

This is the part homeowners are usually surprised by: in Texas, you don't get to choose whether to keep a maintenance contract on an aerobic system. It's the law.

Under Texas Health & Safety Code 366.0515 and the TCEQ rules in 30 TAC Chapter 285, every ATU owner must keep a continuous, signed maintenance contract with a TCEQ-licensed maintenance provider for the life of the system. The logic is simple: ATUs have pumps, aerators, and disinfection that can fail silently, and a failing unit sprays under-treated wastewater onto the surface where people and pets are. The contract exists to catch problems before that happens.

A few things that trip people up:

The requirement never expires. If you cancel with one provider, you're expected to sign with another right away — there's no allowed gap.
The provider reports to your county. After each visit, the licensed provider files a report with the local permitting authority, creating an ongoing compliance record on your property.
It transfers with the house. When you buy a home with an ATU, you inherit the obligation. This is a common surprise at closing — see septic-inspection-buying-selling-home.
Lapsing has teeth. Counties enforce this, and penalties for ongoing maintenance-contract violations have been reported as high as $100 per day.

How often the system gets inspected

TCEQ sets the floor for inspection frequency, and your contract has to meet it.

The default rule (30 TAC 285.90–.91) is that the provider must inspect the system and submit a report at least once every four months — three times a year. If your system uses a TCEQ-approved electronic monitor that tracks equipment and disinfection status, the required interval can drop to once every six months. Reports tied to testing are generally filed within 14 days.

At each visit the technician is checking the working parts and the water quality, not just glancing at the tank:

Aerator/compressor operation and air delivery
Pump, floats, and the high-water/alarm circuit
Disinfection — chlorine tablet level (calcium hypochlorite certified for wastewater) or UV function
Effluent quality and, where required, chlorine residual
Spray heads or drip lines for clogs, overspray, or ponding

What the contract covers — and what it doesn't

A standard contract covers the recurring obligations the state cares about: the scheduled inspections, the testing, the disinfection check, and the reports filed to the county. Higher tiers bundle in more. Roughly what you'll see across price tiers:

Basic (~$300–$350/yr): the required inspections, compliance reporting, and disinfection/chlorine checks.
Standard (~$350–$450/yr): adds chlorine tablet refills, diagnostics, and discounted repair labor.
Premium (~$450–$600/yr): adds emergency response, minor parts coverage, and sometimes annual pumping.

What it costs

Most Texas ATU maintenance contracts land between $200 and $500 per year, with full-service plans reaching roughly $600. That figure usually covers the three required inspections, testing, reporting, and a disinfection check — but read the line items, because pricing varies by county and provider.

Two costs that are easy to overlook: chlorine tablets (if not included, budget a few dollars a bag, used continuously) and tank pumping. The contract is not a pumping plan. An ATU still accumulates solids and needs pumping on its own schedule — see how-often-pump-septic-tank and our septic-pumping-cost breakdown for current rates. Major component failures — a burned-out aerator, a failed pump — are billed separately unless your plan specifically covers parts.

How upkeep differs from a conventional system

A conventional gravity system is low-maintenance by design. You pump it every few years, avoid abusing the drainfield, and that's mostly it — no contract, no mandated inspections in most cases.

An ATU is the opposite: more moving parts, more that can break, and a legal upkeep schedule you can't skip. The aerator runs continuously and is the most common failure point; lose it and treatment quality drops fast. The disinfection step needs constant chlorine or a working UV bulb. And because the cleaned water often sprays onto the surface, a malfunction is a public-health issue, not just an inconvenience. That's the whole reason Texas wraps a licensed-provider contract around these systems. Good homeowner habits still matter on both — see septic-dos-and-donts and what-not-to-flush-septic — but the ATU adds a layer of mandatory, documented professional oversight on top.

Can you maintain it yourself?

Sometimes — but it's narrower than people hope. TCEQ allows a homeowner to apply to self-maintain certain systems only after the first two years following installation, and only if the local permitting authority signs off. You'd still have to meet the same inspection, testing, and reporting standards a licensed provider does.

In practice, many Central Texas counties — including high-growth areas around Travis, Hays, and Williamson — restrict or flat-out prohibit homeowner self-maintenance. Check your county's OSSF page or county directory page before assuming you can drop the contract. For most owners, keeping a licensed provider is simpler, cheaper than a violation, and keeps the paperwork the county wants flowing automatically.