Identifying whether an unpleasant household odor is sewer gas involves recognizing its distinct characteristics and location. Sewer gas smells strongly of rotten eggs or sulfur due to hydrogen sulfide gas, whereas mold smells earthy and damp, and electrical burning smells acrid and sharp. Sewer gas odors typically become noticeable near floor drains, sinks, or washing machine standpipes where plumbing traps have dried out or cracked, allowing sewer air to vent upward. You can troubleshoot odor sources easily by inspecting plumbing fixtures. You can verify that you have identified sewer gas when pouring water down floor drains or refilling dry P-trap pipes causes the rotten egg smell to dissipate immediately, confirming that the gas barrier is restored.
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