Consider installing a backflow preventer to prevent flooding in your building. Recycle oil, paint, and other toxic materials at a recycling center. DO NOT 1. Put grease or egg shells down drains or in garbage disposals. Plant a tree directly over a sewer line.
Roots can be problematic.
Cut down a curbside tree without checking with the city in which you live. Proceed automatically with an expensive repair. Always get a second opinion. Use an unlicensed, unknown contractor to make repairs. Forget to locate cleanout in front of building, prior to having a stoppage.