The main culprit of a collapsed sewer line is typically tree roots. Tree roots naturally seek out water so they are highly attracted to all of the moisture that exists within your sewer line. Unfortunately, these tree roots can end up growing into the actual pipe itself, through the joints, and after decades of use, the tree roots degrade from the constant exposure to moisture. Eventually, the sewer line itself will weaken to the point of completely collapsing. If you are struggling with a collapsed sewer line, call Jersey Boys Plumbing, Heating, and Air to help you replace it right away.