No Dig Sewer Boston. Perma-Liner featured their no dig sewer technology at the NEWEA Expo in Boston last week. If you live in the Boston area, you may have heard the term “no dig sewer” before. The no dig sewer term usually refers to a method of trenchless technology, in Perma-Liner’s case, pipe lining technology. If you live in Boston, do not let your property be damaged due to costly dig and replace repairs… no dig, just Perma-Line it!