Musty or sewer gas smell in one Bathroom


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Old 01-19-09, 08:58 PM
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Musty or sewer gas smell in one Bathroom

We just eliminated our septic tanks and hooked up to the city sewer system two weeks ago. We have 3 bathrooms, 2 up and 1 down. Ever since we hooked up to the city sewer we are getting a musty, sewer gas smell from one of the upstairs bathrooms that has a shower.

I don't understand why only one bathroom. Can anyone help solve this problem?
 
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Old 01-19-09, 09:08 PM
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either the shower is not used often and the trap is dry or the smell is coming from under the toielt, ie. a bad wax seal
 
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Old 01-20-09, 07:46 AM
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Funny Thing Plumbermandan!

We didn't notice the smell while on septic prior to hooking up to the sewer. Wonder why the change all of a sudden?
 
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Old 01-20-09, 07:15 PM
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I would think that it is a wax seal problem, unless you have a drain that does not get used very often.

You see, once you are connected to a city sewer line, you can get positive pressures as well as negative pressures in the pipes. If you have a bad wax seal; unused drain, or a crack in a pipe, there could be a positive pressure pushing the smell out from the problem area. On a septic system, it is very rare to have a positive pressure.

You may also have a vent issue which is making it hard for a positive pressure to leave the system.
 
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Old 01-21-09, 10:51 AM
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We had to pull a toilet here at work a short while back and I was amazed at the amount of air coming up the sewer pipe and the force that it was coming out. Never seen it before till then.
 
 

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