I bought this house about a year ago. I never realized nor did my dumb *&^^&& house inspector ($538) that there was no main plumbing stack. There is however a black plastic (not PVC) pipe that runs into the attic and I am assuming that it goes to the roof vent. I still get this septic smell out of one of the floor vents when the heat pump kicks on. This started probably about 6-7 months ago. There is nothing leaking and everything is P-trapped. It only comes from this one vent. Any ideas would be greatly appreciated. that makes sense what you are saying about the water rotting in the vent. I have blocked that vent and cannot smell it coming out of any of the other vents and they are as far as I can see all connnected. Baffling.
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