Bad Smell in Basement Bathroom
In March 2006, I purchased a single family house and there wre no smells anywhere. After about 1 year there is this rotten smell coming from the downstairs bathroom and only from this location. The sump pump is located in this bathroom and there is a vent in the bathroom; sometimes when the washing machiene is running, it drains into the sump pump, you can smell the odor upstairs in the room above the laundry room. Could this possibly be stale water located inside the pump and it needs to drain? What causes this and how can it be fixed?