Re: Laundry Drain
is this a front load washer, and are you new to front load washers? It could be a dry trap, but if you've been using the washer, then that is not likely the cause unless you've got a damaged drain that is leaking water out of the trap, hence the smell. If it is a front load washer, then it could easily be the washer itself. The seal around the door holds moisture, and if you don't leave the door open after each use to dry, the resulting trapped moisture causes a mildew/sewer odor.
Please give us more information and be as thorough and specific as possible about your use of the machine and when you notice the odor.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!