Name the standard pipe material used in residential plumbing for water supply.

The standard pipe material used in residential plumbing for water supply is copper. Copper has been a trusted material in the plumbing industry for many years due to its durability, resistance to corrosion, and ability to withstand high temperatures and pressures. Its long lifespan and reliability make it an ideal choice for both hot and cold water applications within a home.

Copper pipes also offer additional benefits, such as being recyclable and having natural antimicrobial properties, which can help ensure water quality. While other materials like CPVC, PVC, and various plastics are also used in plumbing systems, they tend to be used for specific applications or conditions rather than the standard for water supply lines in residential settings.

Choosing copper for water supply lines is often recommended by plumbing codes and building practices, providing both safety and efficiency for homeowners.