Fairfax Sewer Relining. Sewer relining is a trenchless method of rehabilitating underground sewer lines. A Fairfax business contacted a local Certified Perma-Liner installer to see what the next steps would be in sewer relining. The business couldn’t operate with the downtime it would take to dig and replace the sewer, so they went ahead and had the Perma-Liner installer reline their sewer. If you live in Fairfax or the Washington D.C. area and are interested in seeing a live sewer relining demonstration, please call us to schedule!