Plumbing Smell Mystery
We had a new septic tank and drainfield installed last fall. Ever since then we have had a VERY strong sewer smell coming from our drains and from the vent pipe on the roof any time we run much water (shower, laundry, etc). I thought the smell was coming from the new tank, so I opened the cleanout (on the drainline between the house and the tank) and left it open. Little or no odor seems to be coming out of it, even when we smell it in the house. It's almost as though the smell is coming from the plumbing inside the house, but we aren't sure how that could be possible, or why it would be happening.
1. What is causing the smell?
2. Why did it start when we got the new septic system?
3. What can we do to get rid of it? It's quite overpowering both inside the house and out.