Re: sewer gas smell in the basement at sump pump
Posted by mark on November 29, 2001 at 14:11:30:
In response to Re: sewer gas smell in the basement at sump pump
: : For the last few weeks we've had a strong sewer gas smell coming from the sump pump. It seems to be only in that area of the basement. We have a dehumidifier sitting next to it and when I empty that water into the sump pump hole the gas smell really comes back at me. Anyone have any idea why we have this smell at the sump pump and what could be done to eliminate it?

: If the sump pump is connected to the sewer line, it should have a "p" trap. It probably doesn't. The p trap stays full of water after the sump pump pushes out the water, and keeps gasses from returning. Usually when the sump pump is standing in water, but not yet pumping, that water acts as a p trap.When you dump water into the sump, the pump empties the water, and the sewer gas smell comes in the house. If you need more help, e-mail me at

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