How do I know the dishwasher is leaking under the floor?
Soft or lifting flooring in front of the dishwasher, swollen cabinet bottoms beside it, or a stain on the ceiling below are common signs. IBHS notes that a leaking dishwasher can let water seep into the surrounding cabinets and flooring (IBHS).
Is dishwasher water clean?
No. Dishwasher overflow is Category 2 water (Massachusetts DPH), so soaked porous materials are handled more carefully than with a clean supply line leak.
What has to be dried?
The subfloor under the dishwasher, the floor and cabinets on each side, and the ceiling below if the kitchen is upstairs. The EPA says the subfloor under flooring must be cleaned and dried (EPA). The EPA says to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth (EPA).
Is a dishwasher leak covered?
Check your policy. Washington's insurance commissioner says slow leaks that develop over more than a couple of days often are not covered (Washington OIC).
Common questions
Can I run the dishwasher after a leak?
Not until the cause is found and fixed. Common causes include the door seal, the supply line and the drain hose.
Why is the floor in front of my dishwasher lifting?
Water under laminate or wood flooring makes it swell. That usually means water has reached the subfloor.
Do I need to pull the dishwasher out?
Usually, to see and dry the floor under it. Shut off the power and water first.
Related guides
Sources
- IBHS: how to prevent interior water damage from plumbing and appliances
- Massachusetts DPH: quick reference, water damage response in buildings
- EPA: Mold Remediation in Schools and Commercial Buildings, Table 1
- EPA: A Brief Guide to Mold, Moisture and Your Home
- Washington Office of the Insurance Commissioner: leaks, water damage and mold
Last reviewed November 13, 2026. This guide is general information, not legal, insurance or medical advice.