Sewer Line Roots Denver. Sewer line roots can be a constant nuisance in the Denver area. If you have noticed slow running drains or backups in your sewer line, roots may be the cause. Once roots enter, they will continue to grow and slowly overtake the Denver sewer line. If you live in Denver and are tired of having your sewer line cleaned free of roots every few months – stop! It’s time for Perma-Liner – the solution to your sewer line roots!