Discovering the exact source of household sewer odors requires systematically inspecting all plumbing fixture traps, wax rings, and vent pipes. Start by checking if every P-trap contains standing water, as dry traps allow sewer gas to enter freely. Inspect the base of toilets for cracked wax seals, examine under-sink connections for cracked pipes, and check the roof vent stack for bird nests or leaves blocking airflow. Verification: Run water in infrequently used guest showers or floor drains to maintain operational trap seals.
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