Trenchless Lining Los Angeles. Trenchless Lining in Los Angeles is a way of replacing your sewer or drain line underground. In other words, no digging! Trenchless lining causes minimal damage and is very environmentally friendly. The non-invasive process of trenchless lining keeps many Los Angeles property owners unaware that a repair is even taking place. If you reside in Los Angeles or the State of California and have questions regarding trenchless lining, please call us or email info@perma-liner.com