Stopping your residential washing machine from emitting an unpleasant sewer gas or rotten egg odor requires addressing plumbing trap and drain hose issues. The primary culprit is a dried-out P-trap in the wall standpipe, which allows sewer gases to vent backward into the room; pouring water down the drain refills this plumbing trap. Another cause is organic sludge decomposing inside dirty drain hoses. You can troubleshoot drain odors easily by checking water flow. You can verify that your corrective action is successful when pouring water down the standpipe to seal the P-trap, cleaning out the lower pump filter, and running a sanitizing hot cleaning cycle with vinegar eliminates the sewer smell completely.
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