Appliances

Dishwasher not draining? How to fix standing water

Updated 2026-06-03 · ~2 min read

Quick answer

Water left in the bottom after a cycle means the dishwasher can't drain. The most common cause is a clogged filter or food debris in the sump, followed by a clogged or kinked drain hose, a full garbage disposal, or — on a new install — a disposal knockout plug that was never removed. Start by clearing standing water, then clean the filter at the bottom of the tub; it solves a surprising number of cases.

Common causes

A clogged filter or food/glass debris in the sump at the bottom of the tub.
A clogged, kinked, or improperly looped drain hose.
A garbage disposal that's full, or whose knockout plug was never removed after a new install.
A clogged air gap on the counter (the small chrome cap next to the faucet).
A failed drain pump.

What to check first

Remove the standing water with a cup and towel so you can work.
Pull and clean the filter/basket at the bottom of the tub — rinse off food and grease.
Run the garbage disposal (the dishwasher often drains through it) and confirm it isn't full.
Check the air gap on the counter for clogs, and the drain hose for kinks or a missing high loop.
On a brand-new dishwasher that's never drained, confirm the disposal knockout plug was removed.

When it's urgent

A dishwasher full of dirty water isn't an emergency, but don't leave it standing — bail it out so it doesn't smell or overflow. If you see water leaking onto the floor or into the cabinet base, stop the cycle and dry it to avoid warping the cabinet and subfloor.

DIY vs. call a pro

You can likely DIY

Cleaning the filter and sump.
Clearing the air gap and running/clearing the garbage disposal.
Unkinking the drain hose and confirming a proper high loop.

Call a pro for

Replacing a failed drain pump.
Electrical or control-board faults.
Persistent drainage problems after the basics check out.

Estimated cost range

Filter and air-gap cleaning is free; a replacement drain pump is $150–$350 installed; a service call runs $100–$250.

Varies by market and brand. The filter and disposal checks cost nothing — always try them first.

How HouseCue helps

HouseCue is a private, homeowner-first app that turns this from a one-time worry into a tracked plan. Snap a photo for an AI diagnosis, upload your inspection report to auto-build a handbook, and get seasonal reminders for your roof, HVAC, water heater, plumbing, and electrical — so nothing slips. Connecting with a pro is always optional and only when you choose.

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Frequently asked questions

Is a little water in the bottom of the dishwasher normal?

A small amount of clean water in the sump area is normal and keeps the seals from drying out. A full pool of dirty water after a cycle is not — that's a drainage problem, usually a clogged filter, hose, or disposal connection.

Why won't my dishwasher drain even after cleaning the filter?

Check the drain hose for kinks, the air gap for clogs, and the garbage disposal (run it and make sure it's empty). If all of those are clear and it still won't drain, the drain pump may have failed, which is a repair best left to a technician.

Does my dishwasher drain through the garbage disposal?

In most kitchens, yes — the dishwasher drain hose connects to the disposal. A full disposal, a clog at that connection, or an un-removed knockout plug on a new install will stop the dishwasher from draining.

Related guides

HouseCue guides are general educational information, not professional inspection, engineering, or contracting advice. Costs vary by market. For safety issues — gas, electrical, structural, or major water — contact a qualified professional.