Clogged Main Drain To Septic Home › Forums › Public Forums › Drainage & Sewerage › Clogged Main Drain To Septic This topic has 1 reply, 2 voices, and was last updated 23 years, 8 months ago by SylvanLMP. Viewing 1 reply thread Author Posts 2 Mar 2001 at 5:49 am #278916 MasterPlumbersKeymaster We just took the toilet off in January to clean a clogged drain and it is plugged again a month later.The water from the washing machine goes into our septic tank and seems to aggravate the problem. What should we do to alleviate this problem? 3 Mar 2001 at 1:32 am #299566 SylvanLMPParticipant Have a video inspection made to make sure none of your piping is back pitched or has a belly in it do to settling. any imperfections should then be taken care of 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