The presence of standing water at the bottom of a residential dishwasher tub is typically caused by a clogged cylindrical sump filter, a blocked or kinked flexible drain hose beneath the sink, a restricted garbage disposal inlet port, or a failing drain pump. If food particles and grease bypass the filter basket, they accumulate inside the narrow drain pump housing, preventing wastewater from evacuating. You can troubleshoot drainage systems easily by inspecting the filter base. You can verify that your corrective action is successful when cleaning out trapped food sludge from the filter and running a forced drain cycle causes the standing water to pump out completely through your kitchen plumbing.
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