Common Threats to Your Home Sewer Line If there is one piece of plumbing that can give you the most stinky situation, it is the sewer line. This potential bottleneck is only about four to six inches in diameter, meaning it is prone to clogging. It also runs several feet underground where you cannot regularly check on it. To make matters worse, tree roots might be growing toward the sewer line without your knowledge. In this article brought to you by Rooter Hero Plumbing, we will go over some threats to your residential sewer line and some protective measures to take.