When a residential dishwasher emits a foul odor resembling a sewer or rotten eggs while running a cycle, the smell is typically caused by sulfur-producing bacteria feeding on trapped organic food waste decomposing in the sump filter, or by a plumbing venting issue where sewer gas backs up through the flexible drain hose due to a missing high loop. You can troubleshoot sulfur odors easily by inspecting the filter and drain line. You can verify that your corrective action is successful when scrubbing the cylindrical filter basket, running a hot vinegar cleaning cycle, and ensuring the drain hose has a proper high loop installed eliminates the sewer smell completely.
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