This is a follow-up to my previous post. The house was built in the 70's so that is how old the drain-field is. I did however dig up the drain-field myself and could find no clog. I flushed the pipes before I reburied them. I just had it pumped last year. I was wondering if it was possible their is an underground spring interfearing with the drainfield as their are allot of them in our area. Also if I do have to replace it does it have to be installed in an alternate area?