What Is the Average Lifespan of Different Sewer Line Materials?

How long your sewer line lasts depends heavily on the material it is made of. Homes built in the Arvada and Denver Metro area before 1980 often have older pipe materials that are nearing the end of their functional lifespan.

Understanding the material of your sewer lateral line helps you anticipate maintenance needs and avoid emergency sewer collapses. Here is a breakdown of the most common sewer materials and their lifespans:

Clay Pipe (Lifespan: 50-60 Years)

Clay was the standard sewer material for decades. While clay itself is highly durable and chemically inert, the joints connecting the short sections degrade over time, making clay pipes highly susceptible to root intrusion and offset joints.

Cast Iron Pipe (Lifespan: 75-100 Years)

Popular mid-century, cast iron is incredibly strong and handles heavy loads. However, cast iron rusts and corrodes from the inside out, leading to scale buildup, snagged waste, and eventual pipe thinning and cracking.

Orangeburg Pipe (Lifespan: 30-50 Years)

Made of wood pulp bound with coal tar pitch, Orangeburg was a cheap alternative used from the 1940s to the 1970s. These pipes are essentially tar-paper tubes. They absorb water, warp, flatten under ground pressure, and fail prematurely.

PVC and ABS Plastic (Lifespan: 100+ Years)

Today plastic is the modern gold standard. PVC and ABS are lightweight, inexpensive, chemically resistant, and feature tight, glued joints that keep tree roots out completely. A properly installed PVC sewer line can last well over a century.