A very strong smell eminates throughout the entire house during the summer. We know it is a sewage issue but do not know how to go about fixing. Four plumbers have given different possible ways to try and solve it but it seems like no one would give a reason of how it it might be happening to begin with. Basically we want to know how the ventilation stack (which is somehow necessary for the toilets to work) may have anything to do with it or if it is something completely different. Basically if anyone on this forum has heard of a problem similar and how they solved it we would like to know. Or if someone could explain how serious sewage smells somehow happen normally that would be great. Its an older 1950s house in Tempe.