Flooded Basement Cleanup: What to Do First

Standing water in a basement can be dangerous in ways that are not obvious. If the water reaches outlets, appliances or the electrical panel, do not step into it — water and electricity are a deadly combination. If you can reach the breaker panel while staying dry, switch off power to the basement; if you can't, call an electrician or your utility and wait. Water that came up through a floor drain or toilet may be sewage, which carries bacteria: wear rubber boots and gloves, keep children and pets out, and wash your hands well after any contact. If you smell gas, leave the house and call your gas company from outside. A basement ceiling that is bulging or sagging means water is pooling above it — keep everyone out from underneath.

Finding where the water is coming from decides what you do next. If a pipe burst, shut off the main water supply — usually near where the water line enters the house — and open a tap upstairs to drain the pipes. If the sump pump stopped, check whether it has power and whether the float switch is stuck; a tripped breaker or a jammed float is a common cause. Heavy rain coming through window wells or foundation cracks can't be stopped while it rains, but clearing a blocked window-well drain or an outside drain can slow it. If water is backing up through a floor drain or toilet, stop running water in the house and call a plumber — this is usually a sewer problem, not something to fix with a bucket.

For more than an inch or two of water, a submersible pump is the right tool — it moves water out through a hose to the yard or a drain, and hardware stores rent them. For shallow water, a wet/dry shop vacuum works, emptied often. Mop and bucket handle the last thin layer. Never use a regular household vacuum on water: it can short out and it will not survive the job. If you have a floor drain, sweep water toward it, but do not push sewage water into a drain that is already backing up. When the water is deeper than a few inches, covers a finished basement, or is sewage, call a crew — they bring truck-mounted extraction that clears a basement in an hour or two, where a shop vacuum would take all day. See flooded basement cleanup and water extraction for what a crew does.

Carry furniture, boxes and anything on the floor to a dry area as soon as the water is low enough to walk safely. Prop furniture up on blocks so air can reach underneath. Carpet that soaked through usually loses its pad — wet pad rarely dries cleanly and holds odor — though the carpet itself can often be cleaned and re-laid if the water was clean. Anything porous that touched sewage should go: mattresses, upholstered furniture, stuffed toys, paper and cardboard. Wash hard items with detergent and water. Photograph everything before it goes, including the water line on the walls; your insurer will want the record. Clothes and linens that touched clean water can usually be hot-washed; anything that touched sewage is safer thrown away.

Drying is where most basement jobs go wrong. Fans alone are not enough — they move air but do not remove moisture, and concrete floors and block walls hold water for days. Run a dehumidifier alongside air movers, and keep them going until moisture readings confirm the space is dry, not just until it feels dry. A crew will usually pull baseboards and drill small holes in the bottom of wet drywall so air reaches the cavity, and they check with a moisture meter against a dry wall in the same house. Expect three to five days of drying for a clean-water loss, longer for a finished basement or in cold weather. Do not start repairs until the readings are back to normal, or paint will peel and mold will grow behind the new work. See structural drying and how long water damage takes to dry.

Mold can start growing on damp drywall, wood and stored belongings within 24 to 48 hours, which is why speed matters more than perfection in the first day. Once surfaces are dry, wash hard surfaces with detergent and water. After sewage, surfaces need sanitizing as well — a crew uses disinfectants made for the job, and porous materials that touched sewage are removed rather than cleaned. Watch for a musty smell in the weeks after the flood, and check behind baseboards and inside closets. If mold does appear over more than a small patch, do not try to bleach it away — large mold growth needs proper containment and removal. See how to prevent mold after water damage.

Call a restoration company when the water is more than a few inches deep, when it is sewage, when the basement is finished, or when water keeps coming back after you have pumped it out. A crew also documents moisture readings and the work done, which your insurer will ask for. DryBridge connects you with local restoration crews any time, day or night — call (833) 462-1975. If you are filing a claim, call your insurer the same day, keep the claim number, and take photos and video before you move much.