What is causing a musty smell in my downstairs bathroom?

David Hird
last month

Last year a musty, sewagy smell developed in and around the downstairs bathroom. During this past hot summer, the smells diapearred completely. Now with summer over, the smells have returned. I’m wondering if this might be a result of mildew. We did have a leak two years ago, which a plumber repaired. Since then we’ve had this re-occuring smell, though not over summer. We are on a septic field, but I pump my tank every 3 years. No signs of field failure outside either. Sometimes, extra use of water in the house, leads to increased smell in this one particular room.

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