washing machine sewer gas smell?

Every drain must have a trap full of water to prevent sewer gas from entering the home. If every trap is full of water, sewer gas cannot enter through the drains so, I would first check to see that the standpipe behind the washer does have a visible trap. I've been in new homes where the plumber simply neglected to put it in. If you can't see one, it is relatively simple and cheap to install one.

One other thing that sometimes causes the water to get out of the traps is a plugged vent stack. To check, have someone go on the roof with a garden hose and an old-style nozzle. Run the hose as far down the vent (or vents) as it will go with the water turned on full. No water should come back up the vent hole and none should come up in the bathtubs or showers. If it does, there is a plug in the vent that must be removed with a plumber's snake.

if you have a P-trap there would be no sewer gas smell. If you can access where the pipe goes into your basement (if you have one) you may be able to see up into the wall from underneath to verify if there is a trap on the line. As a temporary fix, when the washing machine is not in use, remove the hose and stuff a rag into the drain hole. Make sure it is long enough that you don't push it into the drain where you can't get it out again. If you can live with a small hole in your wall behind the washing machine, cut a hole there and see if there is a trap. You can also get a pre-mde plastic access hole cover at most Home Improvement stores. You cut a hole in the wall to install it.

This Site Might Help You.

RE:

washing machine sewer gas smell?

The smell of sewer gas in my 10 year old home is horrific. We had a plumber come power flush all the pipes. He said the p-trap was really dry and flushed a bunch of water down it. I have a family of 5 and do wash all the time so i don't see how it can be really dry. I finally, in...

Maybe he didn't make sure to leave water in the trap if he power flushed it. Have you used it since? If so, I'd guess there is a break in the line somewhere that needs to be repaired. A crack might be present in the pipe lower down than the trap.

Obviously the sewer is backing up. I would call another reliable plumber.

Is isn't going to be something you can sort yourself as far as in aware. You need to be speaking to your local council/authorities and maybe get a different plumbers advice.