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Why Do I Get A Foul Smell From My Basement Bathroom?

I am getting a foul odor from a bathroom in the basement. We hardly ever use this bathroom – except when we have company. This is embarrassing. What can we do?

Plumbing systems are designed to prevent foul odors from entering the house by means of the trap attached to fixtures. Traps contain water to seal out foul odors; if the water seal evaporates, the odors enter the house. To solve this problem, pour a bucket of water in each trap, sink, shower and floor drain. This will prevent plumbing odors from entering the house.