We had the most bizarre sewage problem. The sewage line was blocked by roots and us and a neighbor with a big empty building share this sewer line. For a year now sewage has been backing up into this building and started coming out the window. Finally somebody over there noticed and basically it was 2' high in sewage. So the plumber came out and managed to drill about a 2" hole through the rotts and it came blasting out. The mess is cleaned up now but I needed to get bids on replacing 90' of sewage line. The guy who cleaned up the mess (I was really impressed with the job they did as well) came in at 4100. Another company with a very good reputation came in at 6550.00. Pretty big difference. Little surprising because the high bidder will be out there to replace a sidewalk so this could just be an add on to his other job. Going with the lower bid but I'll be watching him like a hawk. He says it's a one day job. 91' of 6" sewer line plus a double clean out. Gravel fill as well.