What is the primary material used for sewer lines?

The primary materials used for sewer lines include PVC (Polyvinyl Chloride) and cast iron, which are both widely accepted in plumbing systems. PVC is favored for its lightweight, corrosion resistance, and ease of installation. It is also less expensive than some alternatives, making it a popular choice for residential plumbing.

Cast iron has been used for many decades due to its durability and strength, especially in larger systems or where added weight and stability are required. It can handle high pressure and is often used in public sewer systems.

While galvanized steel and brass can be found in plumbing for other applications, they are not commonly used for sewer lines specifically. Galvanized steel may corrode over time when exposed to sewage, and brass is generally reserved for fittings and fixtures rather than main line work. Polypropylene, though sometimes used for specific types of drainage or drainage fittings, does not hold the same prominence as PVC and cast iron for sewer lines.