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 Is it normal for a drain field to block or fail? 31 October 2013 What is biomat? 31 October 2013 What to do with a failed septic system? 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.