Underground Sewer Los Angeles. The underground sewer pipes in Los Angeles have many obstacles: root intrusion, ground movement, calcification and the natural aging of the sewer pipe. Most homeowners don’t think twice about their underground sewer pipes until something happens and it needs to be fixed at the speed of light. Perma-Liner products will rehabilitate the underground sewer pipes for another 50+ years! If you live in Los Angeles or the surrounding areas and would like to know more about the underground sewer infrastructure, please call us any time.