"..............do you have a diagram that will show the basic connections from the house to the public sewage system lines?"
Sewer gas enters a house from many sources.......a dry P-trap is most common (but why is it dry?)...........others include broken or missing pipes or vents.....inadequate or plugged vents.......bad toilet seals......unbalanced HVAC system.......
The "problem" may be identified using a smoke test in the drain line (if permitted in your locale)
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