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Septic System Repair in New Braunfels & Comal County
Septic systems almost never fail without warning. They fail after weeks or months of signals that got ignored. Knowing what to look for is the difference between a few hundred dollars and a five-figure replacement.
Untreated sewage is a health hazard. Keep people and pets off the area, stop using water in the house as far as you reasonably can, and get a licensed professional out.
The warning signs, in the order people usually notice them
Around the yard
- Standing water or persistently damp, mushy ground over the tank, drainfield or spray field
- A patch of unusually green, spongy grass over the system while the rest of the lawn is dry
- Sewage surfacing anywhere on the property
Smell
- A rotten-egg or distinct sewage odour near the tank, the drainfield or the spray area
- Smells indoors near drains, which can mean a venting or backup problem
Indoors
- Drains slowing down throughout the house, not just in one fixture
- Gurgling from drains or toilets
- Sewage backing up into the lowest fixtures
On an aerobic system specifically
- An alarm that will not clear — check power first, then call your provider
- Cloudy, murky or foul-smelling discharge from the spray heads, meaning treatment has failed
- Spray heads not rotating, not covering, or visibly broken
- The compressor silent when it should be running
Reading an aerobic alarm
The control panel is usually mounted on the garage or near the system. Common causes, from most to least likely:
| Cause | What it looks like |
|---|---|
| Power failure | Alarm plus a dead panel. Check the breaker before anything else. |
| Pump failure | Persistent high-water alarm after power, floats and aerator all check out. The most common real fault. |
| Aerator / compressor failure | No air, no treatment. Effluent quality degrades within days. |
| Low air pressure | Often a leak, a blocked diffuser or a tired compressor. |
| Faulty timer | System dosing at the wrong times, or not at all. |
| Clogged spray heads | Pressure builds, coverage collapses, pump works harder than it should. |
Only your licensed maintenance provider should be diagnosing and repairing these — and if you own an aerobic system in Texas, you are required to have one under contract. Why →
Repair versus replace
Mechanical faults are repairs. Soil failure usually is not.
- Repairable: pumps, aerators, floats, timers, control panels, spray heads, broken lines, lids and risers, disinfection units.
- Usually a replacement: a drainfield that has biologically clogged, a cracked or collapsed tank, or a system that was undersized for the house from the start.
There is a local wrinkle worth knowing: a replacement is permitted against current rules, not the rules in force when the original system went in. Owners replacing an old conventional system are often told it can no longer be permitted on that lot, and that an aerobic system is now the only compliant option. That is not an upsell — it is the soil and the Edwards Aquifer rules catching up with an older installation.
Most septic work in Comal County requiring more than routine maintenance needs county authorisation, including major repairs and system modifications. Confirm with the Comal County Engineer's Office at 830-608-2090 before work begins.
What causes failure in the first place
- Hydraulic overload. More water than the system was sized for — extra occupants, added bathrooms, a leaking toilet running for weeks.
- Skipped pumping. Solids carry over into the field and clog the soil irreversibly. Pumping intervals →
- The wrong things down the drain. Wipes, grease, paint, solvents, and bleach in quantity — which kills the bacteria doing the work.
- Compaction over the field. Vehicles, trailers, sheds or stacked material on the drainfield or spray area.
- Root intrusion into lines and tanks.
- Neglected maintenance on an aerobic system, which is exactly what the mandatory contract is designed to prevent.
- Age. Systems do not last forever, and much of Garden Ridge and the older Canyon Lake subdivisions are now at that point.
A licensed site evaluator has to answer that with a soil test — nobody can tell from a map. Send us your address and we will have local licensed pros quote the evaluation and the install. Request free quotes →
Repair questions
My aerobic alarm is going off. Is it an emergency?
Treat it as urgent rather than an emergency. The alarm means treatment has stopped or a component has failed, so the system may be discharging under-treated effluent. Check whether the power is on, then call your licensed maintenance provider. Do not simply silence the alarm and carry on — that is how a repair becomes a replacement.
Can a drainfield or spray field be repaired, or does it need replacing?
Both happen. Clogged spray heads, a failed pump, a bad float or a broken line are repairs. A drainfield that has genuinely failed — soil biologically clogged after years of overloading — usually needs replacing, and on a Comal County lot that often means a new system design rather than a like-for-like rebuild.
Why is the grass over my septic system greener than the rest of the yard?
Because it is being fertilised and watered by effluent that should not be reaching the surface there. Bright green, spongy grass over the tank or field during dry weather is one of the most reliable early signs of failure.
Do repairs need a county permit?
Major repairs and system modifications generally do. Routine maintenance under your contract does not. Ask before work starts — a licensed installer or maintenance provider will know where the line falls, and the Engineer's Office will confirm it.
How much do septic repairs cost?
It spans a very wide range. Replacing a pump, aerator or set of spray heads is comfortably in the hundreds to low thousands. A failed drainfield or a full system replacement puts you back into install pricing — $11,000 to $22,000 locally. Which is why acting on the early signs matters financially, not just environmentally.
Request free septic quotes
Licensed Comal County OSSF professionals will contact you directly. There is no charge and no obligation.