A collapsed sewer line is commonly the end result of several types of untreated sewer line problems. Tree root incursion, offset pipe joints and aging pipe. If left untreated, will lead to the loss of structural integrity of the sewer pipe which eventually leads to the soil above collapsing into the line and completely blocking the flow of wastewater. Once a pipe collapses you will need to have it repaired or replaced in order to restore flow. You know who to call if this ever happens. De Hart Plumbing, serving Manhattan Kansas, Junction City Kansas and Wamego Kansas.