Skip to content

Flooded basement: emergency safety and cleanup

Basement flooding from storm runoff, sump pump failure, or burst pipes creates severe electrical shock and biohazard risks.

Do this now

  1. Do not enter a flooded basement if standing water reaches electrical outlets, appliances, or panel boxes.
  2. Shut off electrical power to the basement at the main breaker panel from a dry location.
  3. If you smell natural gas or suspect gas line damage, evacuate your home immediately.
  4. Stop the source of water: close the main water valve or repair sump pump power.
  5. Call your local utility or a professional water restoration company.

Electrical safety in standing water

Water conducts electricity. Entering standing water that touches electrical wiring can cause fatal electrocution.

  • If your main electrical panel is located in the flooded basement and you cannot reach it without stepping into water, call your electric utility to disconnect service outside.
  • Never operate corded electrical pumps or wet-dry vacuums while standing in water unless using a Ground Fault Circuit Interrupter (GFCI) outlet.

Sump pump failure during heavy rain

Sump pumps fail during storms due to power outages or mechanical clogs.

  • Check if the float switch is stuck under debris in the sump pit.
  • Use a backup battery-powered sump pump or a submersible utility pump plugged into a generator (operated outdoors).

Cleanup and sanitation steps

  • Remove water quickly: Pump out water using submersible pumps. Avoid pumping out deep water too quickly if surrounding ground is saturated, as external hydro-static pressure can crack basement walls.
  • Discard contaminated porous items: Throw away water-soaked mattresses, cardboard boxes, upholstered furniture, and carpet padding.
  • Disinfect hard surfaces: Scrub concrete floors and walls with warm water and disinfectant or plain unscented bleach solution (1 cup bleach per gallon of water).
  • Dry thoroughly within 24 to 48 hours: Use heavy-duty air movers and dehumidifiers to keep humidity under 50 percent and prevent mold growth.

... note "Flood insurance" Take detailed photographs and video of all damaged property and standing water levels before starting cleanup for insurance claims.