Contact: Dan Olson, 218-846-8108
Detroit Lakes, Minn. — The Minnesota Pollution Control Agency (MPCA) has some advice for rural residents concerned about the potential impact of flooding on their septic systems and homes. Here are some things to consider before, during and after a flood:
Before the flood
- Prevent the possibility that floodwater will fill your system and then back up sewage into your home by installing a backflow preventer in the main sewer line leaving your house. This device should be installed by a licensed plumber.
- If you do not have a backflow preventer, block any lower level drains in the home to prevent backup.
- Make plans to minimize water use or flushing of toilets during the actual flooding event.
During the flood
- If floodwater covers your septic tank and/or drainfield or mound, stop using the system. That means no flushing of toilets or using showers or water-expelling appliances, such as dishwashers and washing machines.
- Turn off all water pumps and other electrical devices associated with the septic system. For example, find the circuit breaker that controls power to your septic system pump and turn off the power.
After the flood
- If floodwater has covered your septic tank and drainfield or mound, do not begin using the system again until the soil has adequately dried to allow sewage to be absorbed into the ground and not back up. This may take several weeks.
- As soon as possible, have the septic tank pumped to remove silt particles and prevent them from entering the soil system, where they can adversely affect how the system treats waste. If the system has effluent screens, make sure they are cleaned.
- Inspect all the electrical components of your septic system for damage and exposure. If your system has an advanced treatment device, check with a licensed service provider before operation. All tank maintenance openings/covers must be inspected and fixed or replaced if damage is discovered.
For more information about what to do to protect your septic system and home before and after a flood, see the MPCA fact sheet, What to do with your septic system during a flood.
More information is also available from your county’s environmental services or planning and zoning department.
