The sewer backed up into our house 4 weeks ago. The plumber came and ran the snake from both clean outs next the house. Then he found that 11 years ago when we built the house the guy who ran the lines did NOT put any more clean outs in and our house is over 100 ft from the city main sewer line. So he put one in about half way so he could run the snake from there to the city main. That's where he felt the problem but he got it cleaned out and it ran fine, or so we thought. Two weeks later the top popped off the new clean out; it had backed up again. Our plumber came and snaked it again. The new clean out is never dry; there is always about an inch of water in the bottom of it. I called the city and they came and checked on there end by running about 300 gallons of water through the street manhole to the city main sewer line that ours hooks to and it ran fast; no clogs. I want to mention that our plumber said that there are so many negatives about the way the guy ran our sewer line that it aggravates him. For one thing he dug one ditch and laid the water line and then the sewer line on top of it. He didn't put any gravel down and used cheap schedule 40 pipe, knowing that we were going to lay a long concrete driveway over where the lines run. We live in a very rocky terrain and our plumber said it's bound to settle and crack somewhere along the way. Have you ever heard of laying the sewer line on top of the water line in the same ditch? Do you think we have legal recourse? How expensive is this going to be?