That doesn't sound as bad as it first did. My first thought was a drilled well 8 feet from septic... That's a good way to pollute your water table.I never stated what the current well depth is and do not know it. The owner put it in, likely with a hammer knocking a sand point down. I would guess far less than 40ft. The driller did say he put in his close-by neighbors well in that was nearly 500ft deep. Plus he said there was variety of water formation depths in the area.
Scary thing about drilled wells is that you don't know for sure how far down you'll go until he gets there.