Seattle Side Sewers. Seattle side sewers are privately owned and maintained pipe systems. As these side sewers age, the infrastructure deteriorates leading to root intrusion, ex-filtration and infiltration. Perma-Liner uses a felt liner material impregnated with a 100% solids epoxy mixture to reline the side sewers in Seattle. This pipe relining process will add 50 years of life onto your side sewer. If you live in the Seattle area and you have questions about pipe relining or side sewers, please call us!