Basement Flooded? What to Do First, Hour by Hour

If your basement flooded, stay out of the water until the power to the basement is off, stop the water if it is coming from a pipe or appliance, photograph everything, then get the standing water out and the wet porous materials dried or removed within 24–48 hours. That last window is the one that decides whether this stays a water job or becomes a mold job. If you already know what to do and need to know which company or trade to phone, who to call when your basement floods sorts it by source.

Is It Safe to Go Into a Flooded Basement?

Not until three things are settled.

Electricity. Water in a basement often reaches floor outlets, extension cords, the sump pump, the washer and sometimes the panel itself. If you can reach the main panel from dry ground, switch off every basement circuit. If the panel is in the basement, or you would have to step in water to reach it, do not go down: call the electric utility and ask them to disconnect at the meter. Do not plug in a pump, a wet vac or a fan in that space until an electrician has said the circuits are dry.

Gas appliances. A furnace, water heater or dryer that has been in water is not safe to run. If you smell gas, leave the house and call the gas company from outside. If the water reached the burners or controls, turn the unit off at its gas valve if you can do it without wading, and do not relight a pilot yourself; the manufacturer or a licensed technician checks it first.

What is in the water. The IICRC S500 standard sorts water into three categories. Clean supply water (a burst pipe, a water heater) is Category 1. Washer drain water is Category 2. Anything that came up through a floor drain, toilet or shower, or floodwater and storm runoff that crossed the ground outside, is generally treated as Category 3. Do not wade in Category 3 water without rubber boots and gloves, keep children and pets out, and wash anything it touched. The category 1, 2 and 3 guide explains how the category changes the cleanup.

Basement Flooded: What to Do in the First Hour

Do these in order.

1. 1Make the basement safe. Power off at the panel or the meter, gas appliances off, and treat any water from a drain as contaminated.
2. 2Stop the water. Close the main shutoff for a pipe, the cold inlet for a water heater, the valves behind the washer. For a sump, check the breaker and whether the float is stuck. Stop using toilets, sinks and the washer if water is coming up through a floor drain.
3. 3Photograph everything before you move it. A slow video around the room, the water depth against a wall, the source, and every damaged item where it sits. This is what the insurance claim is built on. The documentation guide has a shot list.
4. 4Get the water out and the drying started. Lift what you can off the floor, then get the standing water extracted and wet materials either dried or removed. For anything beyond a small area of clean water on bare concrete, this is the restoration company's job.

Pipe Burst in Basement: What to Do

Close the main water valve; the water will not stop until you do. Then open a faucet on the lowest floor to drain the lines and turn off the water heater. Photograph the break before a plumber repairs it, because the failed section is evidence. Burst-pipe water is Category 1, which is the easiest case: carpet, pad and drywall are sometimes salvageable if drying starts within the first day. The burst pipe guide goes further.

Standing Water in Basement: What to Do

A shallow layer on bare concrete can be handled with a wet/dry vacuum and a squeegee toward the floor drain. More than that, or water across a finished floor, needs a submersible pump or truck-mounted extraction, and wet vacs are slow enough that the walls keep wicking while you work.

If the water came from rising floodwater outside and the ground is still saturated, do not pump the basement out all at once. FEMA advises pumping it down gradually, because the pressure of wet soil against an empty basement can crack or collapse the walls. That situation is flood damage, handled through a flood insurance policy, not a homeowners claim.

Water in Basement Carpet: What to Do

Pull the carpet back from a corner and look at the pad. The pad acts like a sponge, is cheap, and is almost always cut out and replaced. The carpet itself may be dried and relaid if the water was clean and extraction starts quickly. If the water was Category 2 or 3, or it has sat for more than a couple of days, both carpet and pad go. The carpet and pad drying decision guide walks through it, and carpet replacement cost shows what replacing it runs.

Do not leave wet carpet laid flat and hope it dries. The concrete underneath stays wet, and the underside of the carpet is where mold starts.

Finished Basement Flooded: What to Do

A finished basement holds water where you cannot see it. Drywall wicks water upward well above the line on the floor, and fiberglass insulation behind it stays wet long after the face of the wall feels dry.

The standard fix is a flood cut: the drywall is cut horizontally a short distance above the highest wet reading (not the visible water line), the lower section and the wet insulation come out, and the stud cavity is dried open with air movers and dehumidifiers. Baseboards come off first. Paneling, laminate and engineered flooring often trap water and usually come up. Whether any of it can be saved depends on moisture readings, which is why the restoration company meters the walls before cutting. The wet drywall guide covers when drywall can be dried in place.

If the water was Category 3, porous material it touched is removed, not dried.

Unfinished Basement Flooded: What to Do

Concrete walls and floors survive water well; what suffers is stored belongings, the bottom of wood framing, the furnace and water heater, and the air. Get cardboard boxes, paper and fabric out, lift everything else onto blocks, and run a dehumidifier once the circuits are safe. Watch the relative humidity; a basement that stays damp afterward grows mold on anything organic.

A small area of clean water on bare concrete is a job most homeowners can handle. Water that reached wood framing, stayed more than a day, or came from a drain is not.

When to Call a Restoration Company

Call a water damage restoration company if any of these is true: the water reached carpet, drywall, paneling or wood; it came from a drain, toilet or outside; it has been standing more than a few hours; or you cannot say where it came from. What they do that a homeowner cannot is measure: moisture readings in walls and subfloor, and a written drying log that proves to the insurer the structure was dry before anything was closed up. The basement flooding cost page shows what the work costs; most residential water damage jobs land around $2,000–$6,000.

If the source was a pipe, appliance or water heater, a plumber repairs it. If it came up through a floor drain, a plumber or sewer contractor clears the line. Your insurer gets a call the same day, after the photos. Sump and drain backups are covered only if your policy carries a water backup endorsement, so check your declarations page first.

What Happens When You Call

(888) 840-6512 is answered 24/7 and connects you to an IICRC-certified water damage restoration company taking calls in your ZIP, with no charge for the referral. You will hear a short automated menu: press 1 for water damage or 2 for mold, then enter the 5-digit ZIP of the flooded property. The line goes quiet for about half a minute while it connects. Stay on; then describe what is wet.

Have ready the address with the ZIP, when the water started, what is wet now and whether it is still coming in, and whether you have opened an insurance claim. The company gives you an arrival window for your address on that call. Scope and price are between you and them.

If you rent, do not call; notify your landlord in writing with photos, because the owner arranges the drying.