Since we moved in, there was a strong sewage smell on the back deck near a low vent pipe and smells in the bathrooms. All fixtures are draing fine and the septic pump and drainfield tested ok. Multiple plumbers couldn't solve it. The last plumber put carbon filters on the roof vents...
In regard to the sewer odor problem in Shelby township Michigan: If they have a sump pump in the basement and have a french drain around the perimeter of the house, there could very easily be a broken sewer pipe right outside the basement wall. When it rains, tainted water gets in the...