Aerobic Treatment System Installation
Advanced aerobic (ATU) septic systems for tighter soils and smaller lots — clear, odorless, NSF-40 treated effluent.
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Advanced treatment when your soil needs it
When your soil or lot size won't support a conventional gravity system, an aerobic treatment unit (ATU) is the answer. It aerates and treats wastewater to a clear, odorless effluent before dispersal — tested to NSF Standard 40 and running on a single quiet aerator. We install models from 500 to 1,500 GPD to match your home.
How it works
Extended aeration breaks down waste and reduces it to a clear, odorless liquid in about 24 hours — eliminating the problems of a conventional tank.
When you need one
Required on smaller lots or tighter, slower-draining soils where a standard gravity drainfield won't pass.
Sized to your home
Available in 500, 600, 800, 1,000, and 1,500 GPD models, paired with spray or drip dispersal.
When Texas requires an aerobic system instead of a conventional one
An aerobic treatment unit is not an upgrade you choose for comfort — it is what the rule leaves you when a conventional absorptive drainfield will not qualify. That happens in three common situations around here: the soil grades out as heavy clay with a very low loading rate, there is less than two feet of suitable soil between the bottom of the excavation and a restrictive layer or the seasonal water table (§285.33(b)(1)), or the lot is simply too small to fit the drainfield a conventional system would need. Large parts of the Houston-area coastal prairie hit at least one of those, which is why aerobic systems are the most common new install across the counties we serve.
Spray or drip: how the treated water leaves the system
The treatment unit is only half of an aerobic system; the other half is how the effluent is dispersed. Surface application — spray heads on a timed cycle — needs relatively flat ground and a vegetated cover over the application area (§285.33(d)(2)(A)), and it is the cheaper of the two. Subsurface drip runs the same treated effluent through pressure-dosed tubing buried in the soil at roughly one emitter per four square feet (§285.33(d)(3)(D)). Drip costs more, but it fits tight clay, irregular lot shapes, wooded areas, and properties where nobody wants sprinklers running over the yard.
Two numbers size an aerobic system, not one
The treatment unit is sized from Chapter 285's Table II, which sets a minimum treatment capacity in gallons per day from the home's bedroom count and living area — the familiar 360, 480, 600, and 720 GPD classes. The dispersal field is sized from a completely different number: your design flow divided by the soil's loading rate. This is why two identical houses a mile apart can take the same treatment unit but need very different fields, and why a quote given over the phone without a soil evaluation is a guess. Our sizing guide walks both numbers with the tables.
Maintenance is part of the permit, not an optional extra
Texas treats an aerobic system as equipment that has to be looked after: it must stay under a maintenance contract with a licensed provider, and the provider reports service to the county. That covers checking the aerator and the disinfection, sampling where required, and catching a failing part before it becomes a backed-up yard. Budget for it the way you budget for an HVAC service plan — it is ongoing, it is modest, and skipping it is how an otherwise healthy system ends up in violation.
Frequently asked questions
How do I know whether I need an aerobic system?
The site evaluation decides. If the borings show heavy clay, a shallow restrictive layer, or a high water table, a conventional drainfield will not meet the two-foot separation rule and the design moves to aerobic. Our free land pre-check gives you the likely answer from soil-survey data before you pay for anything.
What does an aerobic septic system need to run?
Power for the aerator and, on a spray system, the pump and controls — so the install includes an electrical run to the unit. It also needs a maintenance contract with a licensed provider, which Texas requires for as long as the system is in service.
Is aerobic effluent safe to spray on the yard?
Treated aerobic effluent is clear and odorless, and surface application systems disinfect before spraying. The rule still requires the application area to be vegetated and the spray to stay on your property, which is part of what the design lays out.
Spray or drip — which should I pick?
If your lot is flat, open, and big enough, spray is the lower-cost option. Drip is the answer for tight clay, small or oddly shaped lots, heavy tree cover, or anywhere you would rather not have sprinkler heads. The soil evaluation usually narrows it before preference does.
How much does an aerobic system cost in Texas?
We price aerobic systems flat by dispersal type — spray at one price, drip at another — with the county permit fee on top. Our cost guide lists the current figures and the total by county so you can see the real number before you call.
Quick Flow Septic installs new septic systems across Harris County · Montgomery County · Fort Bend County · Waller County · Liberty County · Washington County · Grimes County · San Jacinto County · Walker County · Colorado County · Austin County · Wharton County.
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