Why Does My Dishwasher Leave Standing Water At the Bottom After Every Cycle?
Standing water persists at the bottom of the dishwasher after every full cycle, even though the cycle seems to end normally according to the appliance's indicators. This problem is almost always tied to drainage rather than a general appliance malfunction.
The most common causes
| Cause | How it prevents full drainage |
|---|---|
| Dishwasher filter clogged with food residue | Partially blocks normal wastewater drainage |
| Poorly installed high loop under the sink | Can prevent proper drainage if positioned wrong |
| Sink garbage disposal partially clogged, if the dishwasher drains through it | Blocks the shared drainage path |
| Failing drain pump | Less common cause, but possible on an older appliance |
Why the filter is the first thing to check
The filter, generally located at the bottom of the tub and easily accessible by unscrewing or lifting it, catches food residue that could otherwise clog the drain pump. A filter never cleaned gradually accumulates enough residue to slow or prevent full drainage, an easy problem to fix once identified.
How to clean the filter effectively
Remove the filter per the manufacturer's instructions (generally a simple unscrewing or lifting motion), rinse it under hot water removing any visible residue, and reinstall it firmly before the next cycle.
Why a connected garbage disposal can cause this problem
If the dishwasher drains through the sink's garbage disposal rather than directly to the main drain, a partial clog in the disposal also affects the dishwasher's drainage, an often overlooked link between the two appliances sharing the same drainage path.
When the problem persists despite a clean filter
If cleaning the filter doesn't fix the problem, a failing drain pump or a deeper blockage in the shared drainage piping could be at fault, requiring an appliance technician or a plumber depending on the exact source of the blockage.
Frequently asked questions
How much standing water is considered normal?+
A very small amount around the filter can be normal on some models, but a visible puddle covering the tub's bottom indicates a drainage problem.
How often should I clean the dishwasher filter?+
Ideally once a month for regular use, a frequency that prevents residue buildup significant enough to affect drainage.
Can I check myself whether the garbage disposal is clogged?+
Running the disposal alone, without the dishwasher, can reveal a slow-draining issue that confirms a partial clog affecting both appliances.
Can standing water damage the dishwasher over time?+
Prolonged standing water can encourage mold and bad smells, on top of potentially affecting internal components sensitive to constant moisture.
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By Julien Fortin — RBQ-licensed plumber, 10 years of experience in residential plumbing
Updated on July 22, 2026