Dishwasher Leaking Water? Here's What to Check

A leaking dishwasher can cause significant water damage to your flooring, cabinetry, and subfloor if not addressed quickly. The good news is that most leaks have identifiable sources that are visible during or after a cycle. Here's how to track down where the leak is coming from.

Leaking From the Front (Door Area)

Worn or Damaged Door Gasket

The rubber seal around the inside edge of the dishwasher door is what keeps water inside the tub during a cycle. Over time, this gasket hardens, cracks, or gets knocked out of its channel --- especially at the bottom corners.

Inspect the gasket by running your fingers along its entire length. Look for cracks, tears, flat spots, or sections that have pulled away from the door frame. Replace any damaged gasket --- they're specific to your model and available from appliance parts suppliers.

Warped or Misaligned Door

If the dishwasher door doesn't form an even seal all the way around --- especially if it's been bumped or the hinges have loosened --- water can seep out along the bottom of the door. Check whether the door closes and latches evenly. Hinge adjustment or tightening mounting screws often resolves this.

Leaking From the Bottom

Faulty Door Latch or Tub Seal

If water is pooling directly under the front of the unit, the tub-to-door seal may be compromised. This is different from the door gasket and involves the main tub seal assembly.

Pump or Pump Housing Leak

The wash pump and drain pump are located at the bottom of the dishwasher. Worn pump seals, cracked pump housings, or loose pump connections can cause water to drip from the base of the unit. This is more likely on dishwashers over 7--8 years old. Pump seal replacement is a technician repair.

Loose or Cracked Water Supply Line

The water supply line connects to the inlet valve at the bottom of the dishwasher. If the compression fitting has loosened or the line has cracked, it drips during filling. Pull the dishwasher out and inspect the supply line connection at both ends --- at the inlet valve and at the shutoff valve under the sink.

Leaking From the Sides

Side leaks usually mean the dishwasher isn't level. When the unit sits off-level, water pools to one side and can overflow the tub lip. Use a level on the dishwasher floor after removing the lower rack and adjust the leveling feet as needed.

Leaking During Fill (Inlet Valve)

If water is leaking when the dishwasher fills --- not during the wash cycle --- the water inlet valve may be faulty. A cracked valve body or a valve that doesn't close fully causes a drip that continues even when the dishwasher isn't running. Inlet valve replacement is a straightforward technician repair.

Too Much Detergent or Wrong Detergent

Using regular dish soap in a dishwasher creates a massive amount of suds that can overflow the door seal and leak out the front. Only use automatic dishwasher detergent. If you've accidentally used dish soap, run several empty cycles to clear the suds before doing normal loads.

Diagnosing the Leak Location

Run a full cycle while watching the dishwasher from the front and sides. A flashlight helps. Note exactly when the leak occurs --- during fill, wash, drain, or the entire cycle. The timing narrows down which component is causing it significantly.