Recently we noticed a bad smell coming from our downstairs bathroom. When we investigated it further it seem that there was some leakage from base of the toilet. So had a plumber come out, took out the toilet, and informed us that the wax ring had failed. So he replaced new wax ring and reinstalled the toilet. The smell never went away and it actually got very bad. The smell gets especially bad when the temperature outside gets very hot. The smell is like a sewer like smell and its very bad. The whole bathroom smells bad and we can pinpoint it coming from base of toilet since we are unable to smell it from sink or bathtub. This bathroom does not have a fan, just a HVAC vent and window. What could the issue be here? Is it some sort of blocked pipe? blocked vent?

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    Blocked vents and pipes can certainly cause sewer gas/odors for various reasons, but it would be unlikely to come from a toilet that flushes properly. Did the plumber mention anything about water damage, or water/sewage intrusion under the floor? Is this on the 1st floor of a house on a raised foundation, where you could take a look in the crawlspace for sewage ponding/pooling or residual... stuff... from a leak? – Jimmy Fix-it Sep 30 '20 at 0:41
  • I just had to return a new toilet that was cracked - fortunately I looked into its nether regions before placing it in service, said some very bad words about lack of quality control at formerly reputable brands, and stuck it back in the box. Not shipping damage - clearly a manufacturing defect that was ignored and shipped. – Ecnerwal Sep 30 '20 at 1:52
  • It is on the 1st floor on concrete foundation. We brought in a few water restoration damage companies to check out the area (leak only affected a few ceramic tiles by the toilet..no drywall damage behind toilet) and they pretty much recommended there is not much to do since it is so small and localized and underneath is concrete. – JoeyDYI Sep 30 '20 at 4:05
  • If, (and that's a big if) the leak is actually fixed, mopping the area (to the point of "flooding under the toilet", since that is where the problem is, but you probably don't want to remove the toilet again - though that would be an approach to get more direct access to the problem area) with a strong disinfectant solution (choose one, don't get creative and mix things together and kill yourself) to seep down where the stink is and kill it might help. – Ecnerwal Sep 30 '20 at 13:19
  • It is a possibility the new wax ring wasn't installed properly. As simple of a job it is, it does happen. – Phaelax z Sep 30 '20 at 16:40

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