Most appliance water damage is one of two things: a sudden burst hose that floods fast, or a slow drip you can't see until the floor is already soft. Both are handled the same way — stop the supply, then dry the structure, not just the puddle.
The usual culprits
- Washing machine — a burst or split supply hose is one of the single biggest causes of home flooding; it can release dozens of gallons an hour. The drain hose can also back up.
- Dishwasher — a failed supply line, door seal, or pump leaks under and behind the unit, soaking the cabinet base and subfloor.
- Refrigerator / ice maker — the thin plastic ice-maker supply line cracks or its fitting loosens, dripping behind the fridge where nobody looks for weeks.
- Water heater — see our dedicated water heater leak guide.
What to do when you find it
- Shut off the appliance's supply valve (behind/under the unit). If you can't reach it, close the home's main valve.
- Unplug the appliance — don't touch it if it's sitting in water; cut power at the breaker first.
- Pull the unit out if you safely can, so the wall and floor behind it can dry.
- Photograph everything for insurance, then get the structure dried before it warps or molds.
Why the hidden leaks do the most damage
A washing-machine hose burst is obvious — you come home to a flood. The quieter danger is the slow leak behind a dishwasher or fridge that wicks into the cabinet kickplate, subfloor, and the bottom of the drywall. By the time the flooring lifts or a musty smell appears, water has been feeding mold for days or weeks. That's why a "small" appliance leak often turns into a flooring and cabinet job.
Preventing the next one
- Replace rubber washing-machine hoses with braided stainless-steel lines, and check them yearly.
- Turn off the washer's supply valves when you're away for more than a few days.
- Pull the fridge out once a year to check the ice-maker line and fitting.
- Consider an inexpensive water-leak detector or auto-shutoff on the washer and water heater.
Common questions
FAQ
What should I do if my washing machine floods?
Shut off the washer's hot and cold supply valves behind the machine (or the home's main valve if you can't reach them), then cut power at the breaker before touching a unit standing in water. Move wet items, photograph the damage for insurance, and get the floor and walls dried — a burst hose can release dozens of gallons that soak into the subfloor.
Why is my dishwasher leaking onto the floor?
Common causes are a worn door seal, a cracked or loose supply line, or a failing pump or hose under the unit. Because the leak is usually behind and beneath the dishwasher, water soaks the cabinet base and subfloor before you see it on the floor. Shut off the supply, and have the cabinet and subfloor dried, not just wiped up.
How does a refrigerator cause water damage?
Almost always through the ice-maker or water-dispenser supply line — a thin plastic tube that cracks or loosens at the fitting and drips behind the fridge, where it goes unnoticed for weeks. The slow, hidden leak rots the flooring and subfloor behind the unit and can grow mold. Pull the fridge out yearly to check the line.
Can a small appliance leak really cause big damage?
Yes — slow hidden leaks are often worse than sudden bursts because they run undetected. Water wicks into subfloor, cabinet bases, and drywall for days or weeks, and mold can begin within 24–48 hours on those wet porous materials. By the time flooring lifts or you smell must, it's usually a multi-material repair.
Are appliance leaks covered by homeowners insurance?
A sudden, accidental appliance failure — like a burst washing-machine hose — is typically covered for the resulting water damage under an Arizona homeowners policy, though not the appliance itself. Gradual leaks that were ignored over time are commonly denied, which is why documenting the damage and acting fast matters.
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