What is the first thing to do when your basement floods?

Make it safe before you step in the water. Shut off power to the basement only if you can reach the panel from a dry spot, leave right away if you smell gas, then stop the water at its source if you can.

Should I pump all the water out of my basement at once?

Not if the water came from outside and the ground is still soaked. The American Red Cross advises pumping a flooded basement out gradually, about a third of the water per day, because saturated soil can push in walls that lose the support of the water inside.

Does homeowners insurance cover a flooded basement?

It depends on where the water came from. A burst pipe or failed water heater is often covered, a sewer or drain backup usually needs a water backup endorsement, and groundwater or surface flooding needs a separate flood policy. Your policy wording decides.

How fast does mold grow after a basement flood?

Mold can start within a day or two. The EPA says drying wet materials within 24 to 48 hours prevents mold growth in most cases, which is why getting the water out and the air moving matters so much.

Is a wet vac enough to clean up a flooded basement?

A wet vac works for a small amount of clean water on a hard floor. For water across carpet, into walls, or anything from a sewer backup, you need extraction equipment, moisture readings and controlled drying.

What if my basement flooded because the sump pump failed?

Unplug the pump before you touch it, get the water out, and find out why it failed before the next storm. Common causes are a power outage, a stuck float switch, a clogged intake or a frozen discharge line.

Basement Flooded? What to Do First, Step by Step

If your basement flooded, stay out of the water until power to that area is off, then stop the source and start getting the water out. The faster everything is dried, ideally within 24 to 48 hours, the less you lose to mold and tear-out.

Is it safe to walk into a flooded basement?

Not until you know the electricity is off. Water conducts current, and basements hold the electrical panel, outlets near the floor, the furnace and the water heater.

Power: The CDC says to shut off the main power only if you can reach it from a dry spot. If you would have to wade through water to get to the panel, call an electrician or your power company instead. Never switch power on or off while standing in water.
Gas: If you smell gas, leave the house, then call your gas company or 911 from outside. Do not flip switches or do anything that could make a spark.
Carbon monoxide: Never run a gas-powered pump, generator or pressure washer inside the house, the basement or the garage. The CDC says to keep them at least 20 feet from any door, window or vent.
Contaminated water: If the water came up through a floor drain, smells like sewage, or came in from outside, wear rubber boots and gloves and keep children and pets away.

What kind of water is in your basement?

Where the water came from decides how it has to be cleaned up and what can be saved. Restoration crews sort water into three categories, from clean to grossly contaminated.

Type	Common sources	What it means for you
Clean water	Burst supply pipe, leaking water heater	Most materials can be dried if you act fast
Gray water	Washing machine overflow, groundwater seeping through walls or floor	Needs cleaning as well as drying; carpet pad usually goes
Black water	Sewer or floor drain backup, floodwater from outside	Porous materials it touched get removed; full sanitizing needed

Clean water does not stay clean. The longer it sits on carpet and drywall, the more it picks up, so a slow response can turn an easy job into a harder one. If you think you have sewage in the basement, see our sewage backup cleanup page before you start.

What to do when your basement floods, step by step

Work through these in order. Safety first, then the source, then the water.

Make it safe. Power, gas and contaminated water, as above.
Stop the source. For a burst pipe or leaking water heater, close the main water valve. If the sump pump stopped, check for a tripped breaker or a stuck float once the power is safe. If rain is coming in, point downspouts away from the house.
Take photos and video. Get the water line on the walls, the source, and every damaged item before anything moves. Your insurer will want to see it as you found it.
Move what you can. Electronics, papers, photos and rugs go upstairs first. Put foil or wood blocks under furniture legs that stay.
Get the water out. A wet vac handles a small amount. For more, you need a pump or extraction equipment. If water came in from outside and the yard is still soaked, pump it out in stages. The Red Cross advises removing about a third of the water per day so outside pressure does not crack or push in the walls.
Start drying. Open the space to air flow, run a dehumidifier, and pull wet carpet pad. Wet drywall and insulation usually need to be cut out so the wall cavity can dry.
Report the loss. Call your insurance company or agent and keep every receipt.

Professional water extraction and drying covers steps five and six with extraction equipment, dehumidifiers, air movers and moisture readings that show when the structure is actually dry. What is water mitigation?

What can you save, and what should you throw out?

Hard surfaces can usually be cleaned and dried. Soft, absorbent materials often cannot, especially after gray or black water. FEMA advises taking anything wet with floodwater outside if it cannot be cleaned and fully dried within 24 to 48 hours.

Item	Clean water	Sewage or floodwater
Carpet pad	Usually replaced	Throw out
Carpet	Sometimes saved if dried fast	Throw out
Drywall and insulation	Cut out above the wet line	Cut out and remove
Upholstered furniture, mattresses	Case by case	Throw out
Tile, concrete, metal, sealed wood	Clean and dry	Clean, disinfect and dry

Photograph anything you throw away. It is part of your record of the loss.

How long does a flooded basement take to dry?

It depends on how deep the water got, how long it sat, and what it soaked into. Concrete slabs, block walls and the bottom plates of framed walls hold water longer than drywall or carpet.

Humidity and air flow matter too. A closed, damp basement in a Virginia summer dries slowly without dehumidifiers. The only reliable answer is a moisture reading: equipment should stay until the readings say the materials are dry, not until the floor looks dry.

Why does the cause of the water matter for insurance?

Because homeowners policies treat water differently depending on where it came from. Here is the general pattern, but your policy wording decides.

Burst pipe or appliance leak: Sudden and accidental water damage from inside the house is often covered.
Sewer or drain backup: Usually excluded unless you added a water backup endorsement.
Groundwater, surface water or a rising creek: This is flood damage. Standard homeowners policies exclude it, and it needs a separate flood policy, such as one through the National Flood Insurance Program. Even then, NFIP basement coverage is limited to listed items such as furnaces, water heaters, sump pumps and cleanup. Finished walls, carpet and most stored belongings in a basement are generally not covered.

That is why clear documentation of the source matters. We photograph where the water came from, log moisture readings and write the estimate, then send that documentation to your insurer and meet your adjuster on site. Your insurance company decides what your policy covers. Does homeowners insurance cover water damage?

Why do Northern Virginia basements flood?

Mostly from heavy rain, failed sump pumps, and plumbing inside the house. A few local factors make it more likely.

Summer downpours. Fast, heavy storms bring flash flood warnings to Fairfax County, and the National Weather Service has warned that basement flooding can happen quickly.
Clay soils. Parts of Fairfax County sit on marine clay, a high shrink-swell soil the county publishes a homeowner guide about. Clay holds water against foundations, so drainage around the house matters.
Sump pumps that stop in a storm. The same storm that fills the pit often knocks out the power. A battery backup helps. What is a sump pump, and why do they fail?
Older foundations and window wells. Block walls, aging seals and clogged window well drains all let water in.

When should you call a professional?

Call for help if any of these are true:

The water is more than an inch or two deep, or covers more than one room
It came from a sewer backup or from outside
Carpet, drywall or a finished basement got wet
You cannot get it dry within a day or two
You smell mold, or you had water down there before

Our flooded basement cleanup covers the whole job with one crew: pump-out, drying, documentation for your adjuster, and rebuilding the finished basement. If mold already started, read Mold in the basement: causes and how to get rid of it. Not sure who handles what? Who to call for water damage.