We bought a mobile home, put it on some land we bought, had a septic tank put in and have been living in it for 2 years. I keep smelling a strange smell by my smallest bathroom wall. I started reading up on it and found out it might be a crack in the wall pipe that vents the drain lines. The article said go on the roof and pour peppermint oil in the roof vent pipe, go inside the house and if you smell peppermint oil in the house, you might have a crack in the pipe or it might be not fitting snug. Well no smell!

Question, if I go outside where the clean out cap is and take it off, if the odor is coming from gases from the septic tank, would they come out of this clean out before making it into the house? I have noticed my eyes don't burn, but are always crusty in the mornings Not even sure if I just have a stinky bathroom. I smell it under the sink some too.

Please help with any suggestions or advice. I can't take the smell anymore.
Gayle

There could be a crack or leakage in the pipe that cause smell. You can take the help of a professional to solve this problem.

The odors will come out of the cleanout and any faults in your plumbing system. A bad wax seal is often the source of the odor.

Are you talking about the wax seal under the toilet? Are there others in a mobile home? I read once there are vent or filters under the sinks in mobile homes. Is that true? Here's the plumbing under the sink... THANK YOU SO MUCH!






Edited 2 times.

Yes, there's an air admittance valve at the top of the big black pipe in your picture, it just unscrews. Those type only cost a few dollars each and it's possible one of them is at fault. The wax seal under each toilet could allow sewer odors to escape as well.

I covered the air admittance valve under the sink for a test and still smell the bad odor. I do smell the odor in the bathroom, but more so in the hallway right outside the bathroom. Today I'm going to takeoff the cap to the outside clean out pipe and see if that helps. Maybe the septic tank gas will come out of there before coming into my house...if it is septic tank gas, I don't know yet.