Signs of a failing septic system, and what to do next
Septic trouble usually starts small. Catching it early can mean a pump-out instead of a new field. These are the warning signs EPA lists, with Oklahoma steps for homes in Moore, Midwest City, Choctaw and the rest of the metro. Checked November 2, 2026.
Common warning signs
- Water and sewage backing up into toilets, drains or sinks
- Bathtubs, showers and sinks draining very slowly
- Gurgling sounds in the plumbing
- Standing water or damp spots near the tank or drainfield
- Sewage odors around the tank or drainfield
- Bright green, spongy grass over the tank or field, even in dry weather
- Algae blooms in nearby ponds or lakes
Source: EPA: What to do if your septic system fails.
Aerobic system signs
On an aerobic system, a sounding alarm light, a quiet air pump, sprinklers that do not run overnight or a strong smell from the spray all point to a problem. See our aerobic alarm guide and the aerobic rules on chlorine and spray timing.
What to do
- Cut water use: spread out laundry and fix running toilets.
- Keep people and pets off wet areas.
- Call a pumper or septic company. Check pumpers on the DEQ licensed septage pumpers list and installers on the DEQ list of active certified installers.
- If a repair changes the system, the installer needs a DEQ authorization to modify. Fees run $214.36 with a self-inspecting certified installer or $357.28 when DEQ inspects (DEQ fee schedule 2026-27).
Oklahoma rules say the owner must promptly repair a malfunctioning system and clean up the site (OAC 252:641-1-3, DEQ rules). For sewage surfacing at a neighbor's, DEQ's complaint line is 1-800-522-0206 (DEQ fact sheet).
Prevent it next time
EPA suggests inspecting every 1 to 3 years and pumping every 3 to 5 years (EPA: How to care for your septic system). See how often to pump, estimate repairs in the calculator, and when you are ready, compare quotes.
Related: permit steps and fees · inspection when buying · aerobic rules · signs of failure · all septic rules