So Sorry. At son's house the original plumber didn't have a 4" to 6" adapter so he just duct taped the drain pipes together. Excellent growing medium for tree roots.
You lost me Tab. I'm not into construction. Are you saying they removed the sewer line, filled it in with dirt, and now the shit has nowhere to go, so it's backing up?
It has what amounts to 6 houses with out a working sewer for 17 years.
One of those jobs Mexican's won't do.