Just Bought a Home with an Aerobic Septic System in Montgomery County?

Welcome to aerobic septic ownership

Across the fast-growing subdivisions around Conroe, Magnolia, and the FM 1488 corridor, most new-construction homes on smaller acreage don't run on a conventional gravity septic tank — they run on an aerobic treatment unit that injects air into the tank to break down waste, then sprays treated effluent through sprinkler heads across the yard. If your closing disclosures mentioned a "maintenance contract," an "aerobic system," or you notice sprinkler heads scattered around the lawn that don't connect to an irrigation timer, you almost certainly have one.

How to tell what kind of system you have

Look for a green or gray control panel mounted on an exterior wall near the tank — that's the electrical panel for the aerator and pump, and it's the clearest sign of an aerobic system. You'll also typically see 2–6 small spray or bubbler sprinkler heads spread across part of the yard, plus one or more round risers in the ground marking the tank lids. If you only see a single tank lid and no control panel or sprinklers, you likely have a conventional gravity system, which isn't subject to the same permit-and-contract rule — though it's still worth having inspected if you don't know its age or pump-out history.

Your first-month checklist

1. Find the permit. Montgomery County Environmental Health issued a permit when the system was installed. Your closing packet or the previous owner may have it; if not, the county can look it up by address.
2. Check the contract status. Call the maintenance provider listed on the control panel sticker (if there is one) or contact Montgomery County Environmental Health directly to ask whether the system's contract is current and in whose name.
3. Test the alarm. Most control panels have a test button. If the audible or visual alarm doesn't fire, or if it's already going off when you move in, get it looked at right away — it usually means a pump or float has failed.
4. Learn your sprinkler zones. Walk the yard and note where the spray heads are so you don't plant, dig, or let kids and pets play directly on the spray field.
5. Sign or transfer a contract. Don't wait for a violation notice. Get a TCEQ-licensed provider under contract in your name within the first month so the required inspections start on schedule.

What it costs each year

A standard aerobic maintenance contract in Montgomery County typically runs $200–$500 per year, covering the required inspections, minor adjustments, and the compliance reports filed with the county on your behalf. That's separate from repair costs if something breaks — a failed aerator, effluent pump, or control panel is usually a few hundred dollars, while a full system replacement can run $12,000–$20,000 if the tank itself has failed. Budgeting for the annual contract is the cheapest insurance against a much bigger bill down the road.

Common first-year surprises

New owners are often surprised to learn the initial two-year contract that came with new construction has already lapsed by the time they close on a resale, leaving a compliance gap the previous owner never fixed. Others discover the sprinkler zones cross onto areas they planned to fence, landscape, or build a shed on — which matters because altering the spray field can violate the permit. And more than a few new owners get their first alarm chirp within weeks simply because a float got stuck or a breaker tripped during a vacant-home showing period, not because anything is seriously wrong.

Want help figuring out exactly what you've got and what's required? Call us or see our full pricing guide and FAQ for more on aerobic septic ownership in Montgomery County.