My wife and I have lived in our house for 7 years. Her uncle built it on his own out in the country. It's about 20 years old. We started to notice a bad smell when it was really windy or when we did laundry, or showered. We sucked out the septic tank, went from well water to rural water, took out the metal rod in the water heater, covered the basement bathroom toliet, and poured water in the basement traps. None of this has helped. Frustrated of not finding a solution..