Which material is commonly used for residential water supply piping?

Polyvinyl chloride (PVC) is commonly used for residential water supply piping because it offers several advantages that make it suitable for this application. PVC is lightweight, resistant to corrosion, and does not rust, which enhances the longevity of the piping system. Furthermore, it has excellent chemical resistance, making it safe for drinking water and other household uses. PVC is also relatively inexpensive and easy to install, which makes it a popular choice among plumbers and homeowners alike.

While other materials like galvanized steel and cast iron have historically been used for water supply piping, they have notable drawbacks, such as susceptibility to corrosion (in the case of galvanized steel) or being heavier and more challenging to install (in the case of cast iron). Lead, on the other hand, is no longer considered safe due to health risks associated with lead exposure, especially in drinking water. This makes PVC a far more favorable option for modern residential plumbing systems.