Basement Flooded: What to Do Right Now
A flooded basement is stressful, but the order you do things in matters more than speed. The single most important rule: electricity and standing water don't mix.
Handle the safety steps below first, then focus on stopping the source and getting water out fast — the clock on mold starts the moment things get wet.
If this is unsafe or getting worse right now, don't wait — call and we'll route you straight to an independent local pro.
What to do in the first 5 minutes
- Before stepping into any standing water, shut off power to the basement at the main panel — but only if you can reach the panel without standing in water. If not, stay out and call an electrician or your utility.
- Identify and stop the source if it's safe: a burst pipe (find the main shutoff), an overflowing appliance, or storm water coming in at the walls.
- Once power is confirmed off, move valuables, documents, and electronics up and out of the water.
- Start removing water only after the power is off — a wet/dry vac or pump for smaller amounts; leave deep or fast-rising water to the pros.
- Photograph everything for insurance before you clean up, then call a local water-damage crew to extract and dry properly.
Do not do this
- Never enter or wade into standing water until power to the flooded area is confirmed OFF — submerged outlets, cords, or appliances can make the water live and deadly.
- Never touch electrical panels, outlets, or plugged-in devices with wet hands or while standing in water.
- Never assume flood water is clean — storm or ground water is contaminated and shouldn't be handled without gloves and boots.
- Don't run a furnace, water heater, or gas appliance that's been submerged until a pro inspects it.
What's likely going on
Burst or leaking pipe
A failed supply line, water-heater tank, or frozen-then-burst pipe can dump water fast. Finding and closing the main shutoff stops it — clean water, but it still needs quick extraction and drying.
Storm or ground water intrusion
Heavy rain, a high water table, or poor grading pushes water in through walls, floor cracks, or window wells. This water is contaminated and needs professional cleanup.
Sump pump failure
A dead, overwhelmed, or power-lost sump pump lets groundwater rise. Common during the same storms that cause the flooding, so a battery backup is the usual prevention.
Sewer or drain backup
A backed-up main line or floor drain sends Category 3 (black) water into the basement. This is the most hazardous type and always needs professional, protected cleanup.
Diagnose it now
What it typically costs
Professional extraction, drying, and cleanup for clean water runs roughly $3–$4 per square foot; contaminated or sewage water costs more because of protective handling and disposal. If materials stay wet past about 72 hours, mold remediation commonly adds $1,100–$3,400. Fast, professional drying is what keeps the number down. A crew will scope the exact figure on site.
Frequently Asked Questions
What should I do first when my basement floods?
Electricity first. If you can reach the main panel without standing in water, shut off power to the basement. If you can't, stay out of the water entirely and call an electrician or your utility. Only after power is off should you deal with the source and start removing water.
Is it safe to go into a flooded basement?
Not until power to the area is off. Submerged outlets, cords, or appliances can energize the water. There's also a contamination risk if the water came from storms or a sewer. When in doubt, wait for professionals.
How fast do I need to dry out a flooded basement?
Fast — mold can start within 24–48 hours and is likely after about 72 hours of materials staying wet. Quick professional extraction and drying is the single biggest factor in avoiding a much larger mold-remediation bill.
The service that handles this
Guidance only — independent local providers assess and price their own work. Last reviewed 2026-07.
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