Finding that your bathroom or laundry room smells strongly of sulfur or rotten eggs whenever your residential washing machine drains wastewater is typically caused by a dry plumbing P-trap or a blocked plumbing vent stack. When a washing machine pumps out wastewater rapidly, it can create a siphon effect that pulls the protective water seal out of nearby bathroom sink or floor drain P-traps, allowing sewer gases to vent freely into your home. You can troubleshoot plumbing traps easily. You can verify that your corrective action is successful when pouring water down all bathroom floor drains and sink traps to refill the P-traps completely eliminates the sewer gas odor.
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