Standing water in the bottom of the dishwasher is usually one of four things — and three of them you can fix yourself in under half an hour. Here's the order to check.
You open the dishwasher expecting clean dishes and instead find an inch of cloudy water sitting in the bottom. It's one of those problems that feels like it needs an appliance repair call, and usually it doesn't.
Standing water almost always means something is blocking the path the water takes on its way out. Here's how to find it, working from the easiest fix to the least.
Turn the dishwasher off and, if you're going to be working around the drain connections, unplug it or switch off the breaker. Lay a towel down. Bail out the standing water with a cup and sponge — you want the tub empty before you go looking for the blockage.
This is the culprit far more often than anything else, and most homeowners don't know their dishwasher has a filter at all.
Pull out the bottom rack and look at the floor of the tub. In most modern dishwashers you'll find a cylindrical filter in the center or back corner, usually with an arrow showing which way to twist. Turn it a quarter-turn, lift it out, and take it to the sink.
What comes out is often unpleasant — a compacted mat of food particles, labels from jars, a broken piece of glass. Rinse it under hot water, scrub it gently with an old toothbrush, and check the mesh screen underneath it too. Drop it back in and twist to lock.
If your dishwasher is older than about fifteen years it may have a self-cleaning grinder instead of a removable filter. In that case, skip to the next check.
The drain hose runs from the dishwasher to either your garbage disposal or your sink drain. Two things go wrong with it.
First, it can kink. Open the cabinet under the sink and trace the hose. If it's pinched behind a stored bucket of cleaning supplies or bent sharply where it enters the cabinet, straighten it and try a cycle.
Second, it can clog — usually right at the connection point. Put a bucket underneath, loosen the hose clamp with a screwdriver, and pull the hose off. Water will come out, so have the bucket ready. Check the end for a grease and food plug and clear it.
This one catches people after a kitchen remodel or a new disposal install, and it's satisfying to find because it explains everything.
When a garbage disposal is manufactured, the inlet where the dishwasher hose connects is sealed with a thin plastic knockout plug. Whoever installs the disposal is supposed to punch it out. If they didn't, your dishwasher has nowhere to drain — ever.
Disconnect the dishwasher hose from the disposal inlet, shine a flashlight in, and see if there's a plug sitting in there. If so, tap it out with a screwdriver and a hammer, then fish the loose piece out of the disposal chamber with tongs before reconnecting.
If you have a small chrome cylinder on your countertop next to the faucet, that's an air gap — a code requirement in California that prevents dirty sink water from siphoning back into the dishwasher.
They clog. Twist off the chrome cap, lift out the plastic cover underneath, and look for gunk in the opening. Clear it with a bottle brush and rinse. If you've noticed water burbling out of the air gap onto the counter during a cycle, this is almost certainly your problem.
If you've cleared the filter, the hose, the knockout plug, and the air gap and the water is still sitting there, the drain pump itself has likely failed. That's a component replacement inside the machine, and it's appliance repair rather than handyman work.
The same goes for water leaking onto the floor rather than pooling inside the tub — that points to a failed door seal or a cracked hose, and it's worth getting eyes on it before it reaches the subfloor.
Scrape plates before loading — you don't need to pre-rinse, but large food scraps are what fill the filter. Clean the filter every month or two. And run the hot water at the sink for a few seconds before starting a cycle so the dishwasher begins with hot water rather than the cold water sitting in the line.
Working through four checks under a sink on a weeknight is nobody's idea of a good time. For Livd members, this is a standard visit task — we'll clear the filter, check the hose and air gap, and while we're under there, take a look at the connections and the P-trap for anything starting to go.
Already a Livd member? Add "dishwasher not draining" to your task list in the Livd app and we'll handle it on your next scheduled visit.
Not a Livd member yet? Schedule your free home walkthrough at livdhomes.com — we'll look at what your home needs and build a proactive plan to keep small things small.
