Appliance & Water Heater Leak Cleanup
The slow leaks do the most damage. A burst washing machine hose is loud, and you deal with it. A dishwasher seal that weeps a cup of water a day does not make a sound, and it can run for months behind a cabinet before the floor gives way. Most appliance losses fall in the second group.
Where appliances leak, and how to tell
| Appliance | Common failure | Warning sign | How much water |
|---|---|---|---|
| Tank water heater | Corroded tank, failed valve or fitting | Damp or rusty base, dripping from the relief valve line | A full tank, commonly 40 to 50 gallons, plus the supply line |
| Washing machine | Split or loose supply hose, clogged drain | Hose bulging or cracked, damp floor near the machine | Supply line pressure runs until shutoff |
| Dishwasher | Worn door seal, loose drain hose, cracked pump housing | Soft flooring or a musty smell near the kitchen sink | Small and steady over time |
| Refrigerator ice maker | Failing fill line or valve | Wet floor behind the unit, discolored subfloor | Slow, hidden |
| Sink supply lines and traps | Corroded connector, loose slip nut | Damp cabinet floor, swelling base cabinet | Slow to moderate |
Water heaters get their own section
A tank water heater holds a lot of water, and when the tank fails it can release most of it. Tanks corrode from the inside. The sacrificial anode rod that protects the steel wears out, sediment builds up at the bottom and the tank begins to leak at the base or a seam. Many tanks give a late warning: a rusty seam, damp insulation or a puddle that appears and dries.
Age is the quickest clue. Look at the date code on the label. A tank past its first decade deserves a close look every year, and a tank that is rusting at the base is past saving. Ask a plumber about replacing it before it fails. A tankless unit leaks too, but usually at the fittings, in smaller amounts.
The post on water heater leak warning signs lists what to watch for.
Appliance or water heater leaking?
Close the supply valve and call. For a water heater, cut its power or gas as well.
Call (301) 786-0888Shut off the right thing
- Water heater. Close the cold-water inlet valve on top. Turn off the breaker for an electric unit, or set a gas unit's control to pilot or off.
- Washing machine. Close both supply valves behind the machine. Unplug it only if the cord is dry.
- Dishwasher. Shut the valve under the kitchen sink and turn off its breaker.
- Refrigerator ice maker. Close the small saddle valve or the valve behind or under the unit.
- When in doubt. The main shutoff is always an option.
What the cleanup involves
Stop and isolate
The water is shut off, and the appliance is disconnected or moved aside so the floor underneath can be reached.
Extract
Standing water is pumped or vacuumed. If the leak was under a cabinet or an appliance, the toe-kick is removed to reach water trapped behind it.
Open the hidden spots
We check under flooring, behind baseboards and inside cabinet bases. Kitchen and laundry floors are layered, and water travels between layers.
Remove what has soaked
Particleboard cabinet bases, soaked underlayment and flooring that has swelled are removed. Solid wood, tile and concrete are dried.
Dry and read
Fans and a dehumidifier stay on until readings match dry reference points. A leak under a cabinet takes longer than it looks.
A five-minute check, once a year
Pull each appliance forward and look at the hoses and the floor behind it. Check the rubber washer hoses for bulges and cracks. Open the cabinet under the kitchen sink and press the floor of the cabinet. Look at the base of the water heater with a flashlight. Find the main shutoff and make sure everyone in the house can turn it. None of this takes long, and most large appliance losses start with something that would have shown up on this walk.
Slow leaks and the signs of a long one
Look for flooring that is soft near an appliance, a cabinet base that is swelling or discolored, a musty smell near the kitchen or laundry room and a water bill that has crept up. Kitchen and laundry floors often hide water between layers. A floor that feels solid on top can be wet underneath. A leak that has run for weeks or months may already include mold growth on the underside of the floor, and the cleanup will include removal.
Appliance and water heater questions
My water heater is leaking from the top. Is that different?
Water at the top often means a loose fitting or the relief valve is discharging. Water from the bottom often means the tank itself has failed. Either way, shut off the cold water inlet and call a plumber.
Will the cabinets have to go?
Particleboard cabinet bases that got wet typically do. Solid wood and plywood can often be dried in place.
How do I avoid it next time?
Replace rubber washer hoses with braided steel, look behind appliances once a year, check the date on the water heater and consider a leak sensor or an automatic shutoff valve.
Is the water clean?
A supply line or tank leak is clean at first. A dishwasher or washing machine drain leak is gray water. It gets worse as it sits.
How long does drying take after a small appliance leak?
A few days is common, longer if water reached the subfloor or a wall. Readings decide when to stop.
Related leak and drying work
- Water Damage Restoration Stopping the water and drying the structure.
- Ceiling & Drywall Water Damage If the leak soaked through to the floor below.
- Structural Drying & Dehumidification How wet cabinets and floors are dried.