PanicStation.org
UK USA
uk Home & property emergencies basement standing water • crawl space flooding • heavy rain water ingress • sudden basement flood • rainwater in cellar • water in underfloor void • groundwater coming up • storm water in basement • flooded crawlspace • water near electrics • damp and flooding emergency • unexpected indoor flooding • rain caused property flooding • standing water after storm • basement puddles after rain • cellar water after rainfall • water seeping through walls • water around boiler electrics

What to do if…
you find standing water in a basement or crawl space after heavy rain

Short answer

Treat it as an electrical and contamination hazard first. Keep people and pets out, and only go near it once power to that area is safely off from a dry, safe location.

Do not do these things

  • Do not step into the water if it could be near sockets, extension leads, appliances, a boiler, or any wiring.
  • Do not touch switches, plugs, or electrical equipment if you are wet, standing near water, or unsure what’s been soaked.
  • Do not turn gas or electrical appliances back on if they’ve been wet until they’ve been checked by a qualified person.
  • Do not use candles or open flames to “see better” (and if you smell gas, don’t operate switches—leave the area and get help).
  • Do not pump/drain quickly if water is still rising, or if you suspect water pressure outside is still high.
  • Do not throw away damaged items or rip out flooring before you’ve photographed everything for insurance/landlord records.

What to do now

  1. Make it a no-go area. Close the door/hatch if you can, put sturdy shoes/boots on, and keep everyone away from the basement/crawl-space access.
  2. Check for “leave now” danger signs from a safe distance. If you smell gas, hear buzzing/crackling, see sparks, or notice major structural movement/sagging: leave the area and call 999.
  3. Make electricity safe before you approach.
    • If you can reach the consumer unit/main switch without going near water, switch power off.
    • If the consumer unit, meter area, sockets, or any electrical equipment may be wet/underwater, do not touch it. Contact a qualified electrician. If you need help making the supply safe, contact your electricity network operator (DNO) or electricity supplier’s emergency line.
  4. Stop more water entering if there’s a simple, safe action.
    • If water is coming in via a doorway/air brick/window and you can act without wading, block with towels/temporary barriers and move items up off the floor.
    • If you suspect a plumbing leak as well, turn off the stopcock only if it’s reachable without stepping into water.
  5. Document quickly. Take photos/video of: water depth, likely entry points, any affected electrics/appliances, and damaged items/materials.
  6. Start the “who to contact” chain (pick what matches what you’re seeing).
    • Home insurer (or landlord/letting agent) to log the incident and get instructions on emergency drying/restoration.
    • If drains/toilets are backing up or you suspect a sewer issue, contact your water/sewerage company.
    • If it’s linked to highway drains/road flooding, report it to your local council/highways team.
    • For wider flooding information and warnings, use the Environment Agency flood warning service / Floodline.
  7. Only if it’s clearly safe (power off, stable footing): reduce harm while you wait.
    • Ventilate from above if you can (open windows/doors upstairs), and use a battery torch.
    • Move valuables, chemicals, and anything that will wick water (cardboard boxes, fabrics) to a higher level if you can reach them without wading.
  8. If you must remove water yourself, go slowly.
    • Start only once the situation is stable (not actively rising).
    • Use a wet vac/pump only when you’re confident electrics are safe, and stop if you notice new cracking, shifting, or unusual noises.
  9. Treat floodwater as contaminated unless you’re sure it’s clean. Wear waterproof boots and gloves; avoid splashes to your face; wash hands after.

What can wait

  • You do not need to diagnose the exact cause (groundwater vs surface water vs drains) today.
  • You do not need to start ripping out plaster/flooring immediately; often you should wait for insurer/landlord/restoration guidance.
  • You do not need to decide on permanent waterproofing/drainage fixes right now—focus on safety, documentation, and drying.

Important reassurance

This is a common post–heavy-rain emergency, but the biggest avoidable harms come from rushing in—especially around electrics and gas appliances. Slowing down, cutting power safely, and documenting the scene is the right start.

Scope note

These are first steps only to stabilise the situation and prevent irreversible mistakes. Full cleanup, drying, mould prevention, and repairs can require professional assessment and may be directed by your insurer or landlord.

Important note

This is general information, not professional advice. If electrical equipment has been wet, you suspect structural damage, or sewage contamination may be present, prioritise qualified help and follow official/local instructions.

Additional Resources
Support us