smelly drains Home › Forums › Public Forums › General Plumbing › smelly drains This topic has 1 reply, 2 voices, and was last updated 21 years, 8 months ago by TheLocalPlumber. Viewing 1 reply thread Author Posts 8 Aug 2002 at 6:10 am #275707 MasterPlumbersKeymaster I have a 7 yr old house. Sewer/drainage are vented. When any bathroom flush the toilet or after a shower, there is sewer smell from the toilets or shower drains. Everything flushes and drains well. No clogs.What is causing this. 18 Aug 2002 at 5:16 pm #292754 TheLocalPlumberParticipant Smelly,Is it a septic system?BillThe Local PlumberTustin, California Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In