The time that a sewer line will last depends on some factors such as the closeness of trees and the material used in making the pipe. However, the pipe material is the primary determinant. Two materials are mostly used to make sewer pipes; Clay and polyvinyl chloride (PVC) pipes. The use of clay pipes in sewers dates back before the 1980s. They were economical, and thus builders preferred them to PVC. At the time, PVC was not used at all. Clay pipes can last between 50 to 60 years. PVC pipes have been designed to last for longer. They can last for more than 100 years. PVC pipes have been in use since 1980. Despite the durability, sewer pipes are bound to wear out with time. Even though they have been designed to be used for a particular period, it does not necessarily mean that they will. Thus, it is vital to look out for warning signs of a broken down sewer. Such signs include foul smell and strange gurgling sounds. When you notice such, contact an expert immediately.