I own a high effiency washing machine from sears. When we do laundry the room that the washer/dryer is in gets a septic oder in it. I pump the septic tank yearly (not town service) and have even had the septic guy look around in the tank as he's doing it. I have no other septic related problems in the house that I know of and never have a septic smell outside. What could be causing this? (oh, the septic guy sees nothing wrong.) I'm thinking maybe the machine is not fully draining through the pipes and some is being left or something?? Anyone ever heard of this? The house is 30 years old and it's the original system. My septic guy told me at the last pump-out (last July) that the yard would show signs if it was failing and it is not. He said the grass would REALLY be growing awesome over the leaching field again, it looks like the rest of the yard. Help, at my wits end with this.