A sewer line belly is a significant sign that there will be a problem with the line in the future. A sewer line belly is a part of the line that sags slightly, which causes standing water and sewage sediment to buildup in the area. This leads to increased erosion of the pipe which increases the risk of the sewer line breaking. Since the sewer line is buried, a sewer line belly is not something that is easily spotted. That’s why it is important to have a plumber inspect and perform maintenance on your sewer lines at least once every couple of years.