Aerobic Septic Repair in Montgomery County

What's actually wrong with your system? Find your symptom below

An aerobic treatment unit has more moving parts than a conventional septic tank — an aerator motor, an effluent pump, a chlorinator or UV unit, spray heads, floats, and a control panel that ties it all together. When one of those parts fails, the system usually tells you before it becomes an emergency. Here's what the common warning signs mean for homeowners in Conroe, Willis, Montgomery, Magnolia and the Lake Conroe subdivisions.

The alarm is sounding (red light, buzzer)

The control panel on the side of your house has a red light and an audible alarm for a reason: it's designed to alert you the moment the system can't do its job. A steady alarm usually means the aerator has lost power or failed, the tank is at high water, or a float switch has stuck. Most alarms are urgent but not an emergency — you can usually mute the buzzer and wait a day or two for a technician, but the aerator not running means the bacteria in your tank stop getting oxygen, which lets solids and odor build up fast. If the alarm has been going for more than 48 hours, or you're seeing standing water at the same time, call sooner rather than later.

Sprinkler heads aren't spraying

If the spray heads in your yard have gone quiet, the most common culprits are a clogged or worn spray head, a failed effluent pump, or a tripped breaker on the pump circuit. Sometimes it's as simple as a head that's caked shut with mineral buildup — that's a cheap fix. If the pump itself has burned out, that's a bigger job. Either way, dry sprinklers mean effluent isn't being dispersed the way your permit requires, so it's worth having it looked at before your next scheduled inspection flags it as a violation.

Sewage odor around the tank or yard

A working aerobic system shouldn't smell. Odor usually points to one of a few things: the aerator has stopped injecting oxygen (so the tank has gone anaerobic), the chlorinator has run out of tablets, or effluent is surfacing somewhere it shouldn't. This is one of the more common complaints we get from homeowners near Lake Conroe and along the FM 1488 corridor, where smaller lots put the tank closer to the house and to neighbors. Odor is also one of the first things a county inspector notices, so it's worth addressing quickly.

Aerator failure

The aerator is the heart of the system — it pumps air into the tank so bacteria can break down waste aerobically instead of anaerobically. Aerator motors typically last several years but do wear out, and they're one of the most frequently replaced components on an ATU. Signs of a failing aerator include a change in motor sound (or no sound at all), a tripped alarm, and odor. Replacing an aerator motor is a routine repair, not a system replacement.

Effluent pump failure

The effluent pump pushes treated water out to your spray field. When it fails, effluent has nowhere to go, and the tank can back up toward high-water alarm level. Pump failures are common causes of dry sprinkler heads and are usually diagnosed by pulling the pump and checking the motor, the float switch wiring, and the discharge line for clogs.

Control panel or float issues

The control panel manages power to the aerator and pump and reads signals from the float switches that track water level in the tank. Corroded wiring, a tripped breaker, or a stuck float can all cause the system to misbehave even when the aerator and pump are fine. Panel issues are common after heavy storms, which Montgomery County sees plenty of, and after a few years of Texas heat and humidity on outdoor electrical components.

Standing water in the yard

Pooling water near your spray field or tank lids can mean the spray heads are over-saturating one area, a line has broken underground, or the system is discharging more than the soil can absorb. On the tighter, sometimes clay-heavy lots common in newer Magnolia and Pinehurst subdivisions, drainage issues can also make a minor pump problem look worse than it is. We check both the mechanical system and how it's interacting with your yard before recommending a fix.

What repairs typically cost

Costs vary by what's failed and how accessible the components are, but as a general guide: spray head cleaning or replacement and minor float adjustments are the least expensive repairs; aerator motor replacement and effluent pump replacement run higher, since they involve pulling and replacing a submerged or in-line component; control panel repairs fall in a similar range depending on whether it's a wiring fix or a full panel swap. We always diagnose first and quote the actual repair before we start — no guessing, no upselling.

Repair vs. replacement — when a new system makes more sense

Most problems we see are component-level repairs, not full-system failures. A full aerobic septic system replacement in Montgomery County typically runs $12,000–$20,000, so we don't recommend it lightly. Replacement usually makes sense when the tank itself has structural damage, when multiple major components are failing at once on an older system, or when the system was undersized or poorly installed to begin with and keeps causing repeat problems. If your system just needs a pump, aerator, or panel, repair is almost always the right call — and it's a fraction of the cost.

If your alarm is going off, your sprinklers have gone dry, or you're smelling something you shouldn't near the tank, give us a call. We'll walk you through what to check right now and get a technician scheduled. Not sure if it's a repair issue or a compliance issue? Our inspection service and FAQ page cover the TCEQ reporting side of things too.