To pinpoint the source of a persistent sewer gas odor in your home, perform a smoke test or a peppermint test. For the peppermint test, pour an ounce of peppermint oil down suspect roof vents or drains on the roof, and have a helper sniff interior fixtures; the scent will escape through any unsealed trap, cracked pipe, or dry P-trap. Alternatively, check if fixtures have standing water in their traps, and inspect wax rings on toilets or floor drain traps. Verification: Seal dry floor drain traps by pouring water down them to eliminate foul odors.
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