Twice in the last month we have noticed a boiled egg odor (not rotten egg) in an area of our home near the utility room. We live in middle Tennessee and are on a septic tank but have water from the utility company. We have a gas water heater. Today the odor followed a heavy rain. Don’t remember if the first time was after a rain or not. Thanks for any help.
If the gases are being pulled inside by your roof vetns, a charcoal activated vent pipe filter would solve your problem. On the web search engines type in septic gases, or septic odor.