I have had a similar problem with my one downstairs bath/toilet, and one upstairs. No problem in my master bath/toilet thought. But the sewer odor really comes out when the toilets are flushed. I did replace my toilet downstairs about a year ago...after reading this, I am thinking my wax ring didn't seal well. But would that also cause the upstairs toilet smell as well?
I thought my vent as possibly plugged on the roof....so I ran a hose down to clean it out. I actually have two vents coming from roof. I am thinking two of the toilets are on one, and one of toilets on another.
So would a bad wax seal on my downstairs possibly cause both of my toilets to have a smell, one upstairs as well??
Thanks for reply.