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Washing machine overflow: what to do about the water

Last updated October 3, 2026 · By the Valley Water Damage Help Editorial Team

A split supply hose or an overflowing washer can send water under the flooring, into the walls and through to the room below. Stop the water safely first, then use this guide to work out what kind of water it was, where it went and what the cleanup involves.

Calls may be recorded for quality purposes.

Stop the water safely

Electricity first, then the water. Here’s the order.

  1. Don’t touch a washer that’s standing in water. The U.S. Consumer Product Safety Commission warns not to touch wet appliances that are still plugged in. If the floor around the washer is wet, or the outlet behind it might be, switch off the breaker for the laundry area or the main breaker. Do that only from a dry spot. The CDC says that if you’d have to stand in water to reach the panel, call an electrician.
  2. Stop the machine. Once the power is off, or if you’re on dry floor and the washer is still running, end the cycle so it doesn’t pump or fill again. Don’t start another cycle to drain the tub. If the drain is part of the problem, that just adds more water.
  3. Close the supply valves behind the washer. Most washers connect to a hot valve and a cold valve in a box set into the wall behind the machine. Some have a single lever that closes both. Turn them by hand: the Smart Home Water Guide, from the City of Phoenix and other Valley water providers, warns that old or corroded shut-off valves can break. If they won’t close, or water keeps coming, close the main shut-off for the house. Our shut-off valve guide shows where that usually is.
  4. Take photos and video of the washer, the hose or valve that failed, the drain, and every wet area. Arizona’s Department of Insurance and Financial Institutions advises taking pictures before any plumber or restoration contractor shows up.
  5. Start on the water you can reach. Wear rubber gloves, since laundry water isn’t clean. Mop or towel up what’s on hard floors, and move rugs, baskets, boxes and anything stored on the floor.

Where the water came from, and why it matters

How the water got out decides what kind of water it is, and that affects the cleanup.

A supply hose or valve

The hoses behind the washer carry water from the valves to the machine, and they’re under pressure whether or not the washer is running. When one splits or a fitting lets go, water keeps coming until someone closes the valve. This is clean water at the source.

An overflow during a cycle

Water that spills from the tub, a leaking door seal or a drain hose that slipped out of the drain pipe has already been in the machine with dirty laundry and detergent.

A drain that backed up

Washers pump their water into a drain pipe behind the machine, called a standpipe, or into a laundry sink. If that drain is clogged, water comes back up and spills over. If other drains in the house gurgled or backed up at the same time, the clog may be farther down the line. The restoration industry’s IICRC standard lists “wasteline backflows that originate from beyond any trap regardless of visible content or color” among its examples of grossly contaminated water. That’s a different job: see sewage backup cleanup.

Clean water or gray water

The IICRC S500 standard sorts water into categories by contamination. People often shorten them to clean, gray and black water.

An older Northern Arizona University water damage guideline, which paraphrases an earlier edition of that standard, gives broken domestic supply lines as an example of clean water (Category 1) and discharge from washing machines as an example of gray water (Category 2). The current standard’s full wording isn’t published openly, so treat that as a general rule and ask the provider how they classify your water and why.

The category changes the work. The IICRC says that with Category 2 or 3 water, remediation should happen before drying, and restorers should use contamination controls and worker protection. The EPA notes that its material-by-material cleanup table is written for clean water, and advises not to use fans before determining that the water is clean or sanitary. In practice, used wash water can mean more carpet pad and other soft materials come out.

Time matters too. The IICRC notes that time and temperature can change a water’s category, so laundry water that sits for days isn’t the same as water cleaned up the same afternoon.

Where the water goes

Laundry water rarely stays where you can see it.

The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth. The Valley’s dry air helps surfaces dry, but it doesn’t reach water under flooring or inside a wall.

The repair and the cleanup are separate jobs

An appliance technician or a plumber deals with the washer: a new hose, valve, pump or door seal, or a cleared drain. A restoration provider deals with the water that got out. A provider will typically:

The washer may have to be pulled out before the floor and wall behind it can dry, so tell the technician and the provider who is doing what, and when. Before anyone starts, look up their contractor license with the Arizona Registrar of Contractors. Our page on water heater and appliance leaks covers washers alongside other household leaks.

Documenting it for insurance

What you keep and write down early makes a claim easier to follow.

On coverage, the Insurance Information Institute lists accidental discharge or overflow of water from a household appliance among the perils the common HO-3 policy covers, and says water seepage is excluded. The NAIC notes that a policy doesn’t pay to repair items that simply wear out, so the washer itself and the water damage may be treated differently. Read your own policy and see our insurance guide.

Checking the hoses before the next load

Most of this is a few minutes behind the machine:

What happens when you call

No forms and no sign-up. You talk to a restoration provider that works in your area, ask your questions, and decide what to do next.

  1. 1. You call the number on this page

    Your call is routed to an independent restoration provider that serves your part of the Valley, when one is available.

  2. 2. You describe the problem

    Where the water came from, which rooms are wet, how long things have been wet, and whether the source is stopped.

  3. 3. The provider explains next steps

    Scheduling, what an on-site assessment involves, how they document damage for insurance, and pricing are all worked out directly between you and the provider.

  4. 4. You decide

    You are not obligated to hire anyone. Before work starts, ask for the contractor’s license and insurance information and check it yourself.

Frequently asked questions

Is it safe to unplug a washer that's sitting in water?

Not while you're standing in water or the outlet is wet. The U.S. Consumer Product Safety Commission warns not to touch wet appliances that are still plugged in. Switch off the breaker from a dry spot first, or call an electrician if you can't reach the panel without stepping into water.

Should I keep the washer hose that burst?

Yes. Photograph it where it failed, then set it aside with the washer's model information. The Insurance Information Institute advises against throwing out damaged items until the adjuster has visited, and your insurer may want to see the failed part.

Water came out of the drain pipe behind the washer. Who fixes that?

A plumber, since a drain that overflows when the washer pumps out is usually clogged. If other drains in the house backed up or gurgled at the same time, the clog may be in the main line, and the water should be treated as contaminated. See sewage backup cleanup.

I mopped up a small overflow right away. Should anyone check the floor?

If the water stayed on tile or sheet vinyl and you caught it quickly, probably not. If it reached carpet, baseboards, plank flooring seams or the wall behind the washer, a moisture meter can show what the mop missed. The EPA says the floor underneath has to be dry too, not just the surface.

Will the drywall around my laundry area have to be cut out?

Not always. For clean water, the EPA says drywall may be dried in place if there's no obvious swelling and the seams are intact. Water that drained out of the washer is usually treated as more contaminated, so a provider may remove more of the lower wall. Ask to see the moisture readings behind the decision.

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