From septic to city sewer...now gas!
We have lived in our house since 1999 with septic system. We NEVER experienced any sewer gas. In April, 2012, we had to connect to the city sewer lines. No smells right away. Indiana had a summer drought, however once the rains began...so did the Sewer Gas. Pattern is: rain, from drizzle to downpour, (doesn't matter), sewer gas appears both inside and outside. After several days of dry weather, the smell goes away. What changed from no smells on septic to terrible problems no on city sewer? Why does rain bring smell? We are several hundred feet away from the sewer line in the street. The clean outs in the yard barely smell if at all.
So my wonderful friends here in the Plumbing forum here are the details:
1. Smells occur ONLY after a rain and are very string OUTSIDE on both ends of the house.
2. Odor does come inside and seems to be most highly concentrated in a second floor closet, not near any vent or plumbing. There is no air duct into this space.
3. NO smell in attic
4. Partial basement then crawl space. No leaking in crawl or smell in crawl. Everything appears OK.
5. NO SMELL coming from any drains or in any bathrooms.
6. Ran water down 4 roof vents. One is blocked. It services one bathroom. This bathroom never smells. Plumbers cant get the snake to go thru. May try high pressure water treatment.
7. Worst smell is at the opposite end of the house.
8. Reminder, we never had a problem while on septic system.
Any thoughts? Going to do the smoke test I guess.