Yes, sewer gas odors can frequently come and go based on environmental conditions, barometric pressure changes, and how often specific plumbing fixtures are used. For example, a rarely used guest bathroom shower P-trap can slowly evaporate over several weeks, allowing sewer gas to escape intermittently until someone runs the water again. Similarly, strong wind gusts across an obstructed roof vent stack can force sewer gases back down through household drain traps. Verification: Pour water down unused floor drains and P-traps monthly to keep vapor barriers fully charged.
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