When a residential dishwasher smells bad and has standing water that is not draining, the foul odor is caused by trapped wastewater mixed with decomposing food particles sitting stagnant in the sump basin. When food debris rots in a warm, unventilated environment, it breeds sulfur-producing bacteria. You can troubleshoot drainage blockages easily by cleaning the cylindrical filter. You can verify that your corrective action is successful when bailing out the stagnant water, clearing food sludge from the filter basket, and running a manual forced drain cycle eliminates the putrid odor and leaves the tub clean.
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