Septic Alarm Going Off
The alarm is warning you that levels or a mechanical component are outside normal range — you usually have hours, not days.
Most on-site systems with a pump or treatment stage have a high-level alarm, and some also alarm on aerator or power failure. The alarm point is deliberately set below the level at which wastewater backs up or surfaces, so it exists to give you a small window to act.
Silence the sounder if you need to, but treat the clock as running. Reduce water use across the household immediately and get a request in with the panel make, any codes showing, and what changed just before it started.
Common triggers
- Pump failure or a tripped pump circuit
- Float switch stuck, tangled or failed
- Aerator or blower failure
- Power cut affecting the control panel
- Disposal field saturated after heavy rain
- Unusually high water use over a short period
Do this now
- Cut water use — postpone laundry, dishwashing and long showers
- Note whether it is a level alarm, fault light or audible only
- Check whether the property has had a recent power interruption
- Keep the chamber closed and stay clear of it
What not to do
- Do not open the pump chamber
- Do not reset repeatedly to keep the alarm quiet
- Do not work on wiring — that is an electrician's job
Frequently asked questions
- The alarm went silent on its own — is it fixed?
- Almost certainly not. Levels typically fall once water use stops, which clears the alarm without addressing the cause. It will return.
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