Septic alarm going off? A step-by-step for Central Ohio homes

The buzzer goes off in the garage, or a red light starts blinking on a post beside the mound. On a Central Ohio septic system, that alarm is almost always telling you one of two things: water is rising in a chamber, or air has stopped flowing in an aerobic unit. Here is how to work out which, one step at a time.

Step 1. Silence it, but leave the power on

Most panels have a silence or test button. Press it to stop the buzzer, and leave the panel and its breaker switched on. The light usually stays lit until the problem clears, and the panel may need power to run the pump once the fault is fixed. Unplugging the panel or flipping its breaker hides the warning without fixing anything.

Step 2. Stop sending water

An alarm on a pump chamber means the water level has passed the high-water float. There is some reserve above that point, but how much depends on the design, and a load of laundry or a long shower can use it up quickly. Hold the washer and dishwasher, keep showers short, and ask everyone in the house not to run water they do not need until the system has been checked.

Every gallon you do not send is a gallon that does not end up on the basement floor.

Step 3. Figure out what kind of system you have

Alarms in this region usually belong to one of three setups:

• Mound or drip system: a dosing tank with a pump sends effluent to the mound or drip field in measured doses. Most mounds in Delaware, Union, and Madison counties have one.
• Lift station: a pump pushes effluent uphill to a field, which is common on the rolling ground around Granville and Alexandria.
• Aerobic treatment unit: an aerator or compressor feeds air to the treatment chamber. Some panels alarm on high water, some on low air pressure, and some on both.

The label inside the panel door, or the permit drawing from the county health district, usually tells you which you have. What a pump chamber is explains the parts.

Step 4. Check the simple causes

Work through these before assuming the worst:

• Breaker: is the circuit for the pump or aerator tripped? Reset it once. If it trips again, leave it off and call, because that points to a failed motor or a wiring fault.
• Recent outage: did the power go out? During an outage the chamber keeps filling with no pump running. When power returns, the pump should catch up and the alarm should clear within a few doses.
• Heavy water day: did the house run several loads of laundry, host a crowd, or drain a hot tub? A timed dosing system can fall behind temporarily.
• Aerator sound: on an aerobic unit, is the aerator humming? Silence where there is normally a hum means it has stopped.

Do not open the dosing tank or reach into any chamber. Tank gases can overcome a person in seconds, and floats are best handled by a technician with the right tools.

Step 5. Decide how urgent it is

• Alarm cleared after an outage and stayed off: schedule a routine check and mention it at the next service visit.
• Alarm clears overnight after a heavy water day, then returns: the pump is falling behind or the timer settings need adjusting. Book a visit this week.
• Alarm stays on with the breaker on and water use cut back: likely a failed pump, a stuck float, or a clogged pump screen. Call the same day.
• Alarm plus gurgling drains or a backup at the lowest fixture: the reserve is gone. Call now for same-day service.
• Aerobic unit silent and smelling like rotten eggs: aeration has stopped. The unit will keep passing flow, but treatment suffers until the aerator runs again, so call for service.

Why alarms cluster in certain weeks

Alarms are not random, and the calendar often points at the cause. Spring and summer storms bring lightning and outages, which stop pumps and can damage control boards. Long wet spells can raise the water in a chamber that is not fully watertight, as groundwater seeps in through old joints or a loose riser, so the pump runs more often and eventually falls behind. Holidays bring guests, extra laundry, and a dishwasher running twice a day, which is when a marginal pump or a badly set timer finally shows itself. And the first hard cold snap can freeze a discharge line that does not drain back between doses. If your alarm tends to appear in the same situation every year, tell the technician; the pattern is often more useful than the alarm itself.

Step 6. Afterward, prevent the next one

Most alarms trace to parts that wear: pumps, floats, check valves, aerator diaphragms. EPA advises inspecting systems with electrical float switches, pumps, or mechanical components about once a year, and Central Ohio operation permits reflect that. Delaware and Pickaway put mechanical systems on one-year operation permits, and Pickaway requires a service contract with a manufacturer-approved company for them. A yearly visit catches a sticking float or a worn diaphragm before it trips an alarm at 10 p.m. on a holiday weekend.

A few owner habits help too:

• Test the alarm when you test the smoke detectors.
• Keep the panel reachable and its label readable.
• Spread laundry across the week.
• Keep the service reports, since your health district accepts them as proof of maintenance.

If the light is on right now and you are not sure which step you are on, run the symptom checker or call us and describe what the panel shows.