I bought this house about 5 yrs ago and have problems with water/sewage in the basemnet. I had the city foreman come out 2 years ago because i was told by roto rooter that I had roots in my sewr pipes which were causing blockage so the foreman had a tree cut down and the main pipe to my house replaced. Now 2 years later same issue. When I do laundry the water backs up thru the drain. Not when in rains, only from water INSIDE the house. Where would the blockage be?? HELP!!! Tired or paying people for unneccesary work!