Finding a foul rotten egg odor emanating from your washing machine drain is typically caused by dried-out P-trap water seals allowing sewer gases to vent upward, hydrogen sulfide gas produced by organic lint and bacteria decomposing inside stagnant drain hoses, or a clogged plumbing vent stack. When wastewater sits in dirty hoses or trap pipes, anaerobic bacteria thrive. You can troubleshoot drain odors easily by checking water flow. You can verify that your corrective action is successful when running a sanitizing cleaning cycle with bleach, cleaning out the lower pump filter, and ensuring the drain standpipe P-trap is full of water eliminates the rotten egg smell and keeps your laundry room fresh.
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