Which type of pipe is typically used for potable water supply lines?

Copper and PVC are commonly used for potable water supply lines due to their favorable properties for drinking water systems. Copper is highly durable, resistant to corrosion, and has natural antimicrobial properties, making it an excellent choice for maintaining water quality. Additionally, copper pipes can handle high temperatures and pressures, which is important in plumbing systems.

PVC (polyvinyl chloride) is another widely used option for potable water systems. It is lightweight, resistant to corrosion and chemicals, and has a smooth interior surface that reduces the potential for biofilm growth. Its ease of installation and lower cost make PVC a popular choice for modern plumbing applications.

In contrast, galvanized steel is prone to corrosion over time, which can lead to the leaching of metals into the water supply, making it less suitable for potable water. Polyethylene, while flexible and resistant to certain chemicals, is typically not the first choice for rigid supply lines in residential plumbing because it can be affected by UV light if installed above ground. Cast iron, while durable, is heavy and primarily used for drainage systems instead of direct water supply. Therefore, the best materials for potable water supply lines are copper and PVC due to their safety, durability, and efficacy in water distribution.