Dave, I live in the Atlanta area and operate a plumbing business there. A lot of the houses that I plumb are on septic tanks and occasionally we are having problems with a sewage smell. In most cases, it happens when we have had a good bit of rain. Everything is vented properly and we have done smoke tests on several of the houses. The only problem that I have found with any of the smoke tests was that one of the houses was letting the smell come back through the toilet. I would ...

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