Your septic tank overflows? Your drain field is probably clogged and saturated preventing the water from infiltrating into the soil. Tags: Your septic tank overflows? You Might Also Like Does a drain field clogs absolutely after 15 or 20 years of operation? 31 October 2013 What to do with a failed septic system? 31 October 2013 What can cause my septic system to fail? 31 October 2013 Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.