S.
Getting the tree roots out would not solve your problem for very long. Does not really seem worth the money to pay that much without fixing the sewer line. Now if he meant that it would be $850 to fix the hole in the line besides clearing away the tree roots, that might be worthwhile. But if it's just for taking out the roots, you would be wasting your money even if that is a good price. You need to look into whether you are going to have to replace the sewer line, and get a price for replacing the line. I use Bobby Renfro, who works a lot in Mesquite; his number is ###-###-####. I have used him for more than a decade and I have a ton of rental property. good luck.