04/16/2026
Well and Septic: Flood Safety
District Health Department #10 (DHD #10) is reminding residents that flooding can disrupt septic systems and contaminate private drinking water wells, which can create serious health risks for homeowners. DHD #10 is urging residents to be cautious before flooding occurs and use caution during cleanup and recovery.
“Flooding can cause damage that isn’t always visible,” said DHD #10 Environmental Health Director Max Bjorkman. “Taking the time to protect septic systems when you can and testing private wells before returning to normal use, helps identify contamination to our residents’ drinking water while also helping prevent illness.”
Below are tips from Michigan’s Department of Environment, Great Lakes, and Energy (EGLE):
Private Well Safety During Flooding
Before Floodwaters Arrive
• If floodwater reaches your well, the water may become unsafe to drink.
• Store enough clean or bottled water for drinking and food preparation.
• Shut off electrical power to the well before flooding occurs.
• If the well cap or seal is not watertight, cover it with a heavy-duty plastic barrier and secure it tightly.
• Gather and protect well construction and service records.
After a Flood
• Do not drink well water until testing confirms it is safe, even if the water appears clear.
• Use bottled water or boil water for at least five minutes before use.
• Contact a certified well contractor for inspection if flooding reached the well.
• Have the well tested for coliform bacteria before returning it to regular use.
Protect Your Septic
Before a Flood
• Make sure your septic system is working properly and fix leaks to reduce excess water.
• Direct surface water away from the septic area if possible.
• Do not empty your septic tank ahead of flooding; empty tanks can shift or float.
• Seal tank lids, risers, and cleanout caps, and plan to conserve water during a flood.
During a Flood
• Avoid using toilets, sinks, dishwashers, and washing machines.
• Never direct sump pumps or water softeners into the septic system.
• Turn off power to septic pumps and alarms.
• Watch for slow drains or sewage backing up inside the home.
After the Flood
• Do not use your septic system until the water has receded and the soil has dried.
• Check for damage such as sinking ground, sewage on the surface, or strong odors.
• Contact DHD #10, or a professional, if damage is suspected.
• Avoid driving or parking over the drainfield; repair erosion and reseed grass.
• Wear protective gear when cleaning and never dispose of floodwater or chemicals into the system.
For more information from EGLE regarding well safety, please visit: https://www.michigan.gov/egle/-/media/Project/Websites/egle/Documents/Programs/DWEHD/Water-Well-Construction/Protecting-Your-Private-Water-Supply-in-an-Emergency.pdf.
For more information about DHD #10, please visit: https://www.dhd10.org/.
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