Why is my dishwasher leaking from the bottom?
Updated August 2026
Water pooling under the front of a dishwasher after a cycle is most often a worn or food-crusted door gasket that no longer seals, closely followed by too much detergent or the wrong soap whipping up suds that push past the door. Both are $0 to $40 fixes you can handle in an afternoon. Wipe and inspect the gasket first, switch to a dishwasher-only detergent, and if the puddle keeps coming back, work down to the hoses, pump seal, and float below.
Safety first: dishwasher leaks are sneaky because the water runs under the cabinet and into the subfloor before it ever shows on the kitchen floor. If the flooring in front of the unit feels soft or the cabinet base is stained, you may already have rot or mold, a $500 to $3,000 repair. Slide a paper towel under the front edge to catch the first drips, and if water reaches the outlet or the unit's own wiring, shut the circuit off at the breaker before you mop up.
Causes, most likely first
| Cause | How likely | The fix | Typical cost |
|---|---|---|---|
| Worn or dirty door gasket | Most common | Wipe the rubber seal with a damp cloth, check for cracks or flattened spots, and replace a hardened gasket. It presses in by hand on most models. | $0–40 |
| Too much or wrong detergent (suds overflow) | Most common | Switch to a dishwasher-specific detergent, never hand dish soap, and cut the dose. Excess suds force water past the door seal. | Free |
| Cracked or loose hose or clamp | Common | Pull the lower kickplate and feel the fill and drain hoses and clamps for drips. Tighten a loose clamp or replace a split hose. | $10–60 |
| Failed wash-pump or motor seal | Occasional | Water leaking from the center of the tub floor points to the wash-pump seal. A tech replaces the seal or pump assembly. | $150–300 |
| Overfilling float or inlet valve | Occasional | A stuck float switch or a valve that will not shut lets the tub overfill and spill. Free the float or replace the $15–40 valve. | $100–250 |
| Cracked tub or sump gasket | Rare | An aged tub seam or sump seal weeps at the base. On an older machine this repair rarely pays off against a new unit. | $200–350 |
Check these first
- Run a short cycle and watch the front lower corners with a flashlight to see exactly where the water escapes.
- Open the door and run a finger around the gasket. Food debris, a torn spot, or a flattened section all break the seal.
- Check the detergent. If you ever used regular dish soap or overfilled the cup, run an empty rinse cycle to clear the suds first.
- Confirm the dishwasher sits level front to back. A unit tilted forward drains water toward the door.
- Remove the bottom kickplate and look for drip trails on the hoses, clamps, and the pump housing.
Prevent it next time
Most bottom leaks trace back to a gasket that never gets cleaned and a filter that lets grease build up. Wipe the door seal every month when you clean the dishwasher filter, and run a descaling cycle a few times a year so mineral scale does not hold the door open a hair. Measuring detergent instead of eyeballing it stops the sudsing overflow for free. A dishwasher that leaks despite all this is usually past the 9-to-12-year mark where a new unit beats chasing seals.
When to call a pro
Call an appliance tech when the water comes from the center of the tub floor rather than the door, when the pump area drips, or when a new gasket and correct detergent do not stop it within a couple of cycles. A service diagnostic runs $90–150, a pump seal or drain-pump job $150–300, and an inlet valve about $100–250. On a dishwasher over 10 years old, put that money toward a replacement instead of a repair that may not be the last.
Most of the causes above are maintenance problems wearing a disguise. OnOtto keeps the boring prevention on schedule so the 2 a.m. version doesn't happen.
Stop chasing symptoms, free for 30 daysFrequently asked questions
Can I keep using my dishwasher while it leaks a little?
For a cycle or two while you find the source, yes, but put down towels and check the cabinet floor after each run. A slow leak that seems harmless soaks into the particleboard cabinet base and the subfloor, where it feeds mold and warps the material over weeks. If the leak is more than a few drops, or if water is reaching the electrical outlet the dishwasher shares, stop using it and cut the breaker until you fix the seal, hose, or pump.
Why does my dishwasher only leak sometimes?
Intermittent leaks usually mean detergent or load-related suds, not a broken part. Too much soap, regular dish liquid, or a rinse-aid overdose foams up and escapes past the door on heavier cycles but not light ones. A gasket that only leaks on hot cycles has hardened and no longer flexes to seal. Track which cycle and which detergent dose leaks, and you can usually tell a suds problem from a worn gasket without pulling the machine apart.
Is a dishwasher leak covered by home insurance?
Sudden, accidental water damage from a burst dishwasher hose is often covered, but slow leaks that rot the floor over months are usually excluded as a maintenance issue. That is exactly why catching a small leak early matters. A single service visit of $90 to $150 is cheap next to a $2,000 subfloor and cabinet repair a policy may deny. Photograph the damage, check your deductible, and read the water-damage exclusions before assuming you are covered.
How do I tell if it is the gasket or the pump?
Location tells you. Water at the front, right below the door, points to the door gasket or a sudsing detergent. Water that appears in the center of the tub floor or at the back, especially during the wash and drain portions, points to the pump seal or a hose clamp underneath. Pull the lower kickplate, run a cycle, and watch with a flashlight. The spot where the first drip forms names the part far faster than guessing.