Hi. I was hoping someone could help me. I'm a new homeowner and since I bought my home in December, we have had a sewage smell that has gotten worse. Originally we couldn't figure out where it was coming from but we narrowed it down until we found it is coming from the drain in the ground for the furnace and water heater. I've read that when drains are leaking a sewage smell it means that maybe they are dry and so the gas isn't getting trapped with water, so we poured about a gallon of water down it. The next day it smelled the worst it ever has. It also seems to smell every time we have heavy rain or snow. Since it is not a drain like a bathtub drain with parts that can be replaced, but rather just a hole in the ground, I'm not sure what else to try. Please someone help me!