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Public Health
Seattle & King County
401 5th Ave., Suite 1300
Seattle, WA 98104

Phone: 206-296-4600
TTY Relay: 711

Toll-free: 800-325-6165

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Septic tank systems during power outages or floods

Power outages

  • Reduce your water use to a minimum, especially if the system has a pump. If all the reserve storage inside the chamber is used, the waste pipes in your home can back-up. There is usually a one-day supply of emergency storage space available in the pump tank.
  • Turn off the pump at the control panel.
  • WARNING: If the power outage caused the pump to malfunction, do not enter the pump chamber. Gases inside pump chambers are toxic and can be fatal. It is best to call a certified septic system installer for service or repair.
  • After power is restored, switch the pump on and let it run for a maximum of 5 minutes, and then turn it off. Repeat this manual switching every 6 hours until the effluent drops to the "OFF" level and the pump turns off by itself. If only a small amount of water was used, the pump may automatically turn off during the first switching.
  • CAUTION: When repairing the pump, always turn off the power supply at the circuit breaker and unplug all power cord before handling the pump or floats.

Floods

  • Septic tank systems that have been flooded should not be used.
  • After waters have receded, check the system for broken lines or sewage surfacing.
  • Correct any problems before using the system.
  • After the water has receded, switch the pump on and let it run for a maximum of 5 minutes, and then turn it off. Repeat this manual switching every 6 hours until the effluent drops to the "OFF" level and the pump turns off by itself. If only a small amount of water was used, the pump may automatically turn off during the first switching.