What material is commonly used for potable water distribution systems?

Copper is a commonly used material for potable water distribution systems due to its unique properties that make it suitable for this application. One of the primary reasons for its use is that copper is highly resistant to corrosion, which is crucial in maintaining the quality of drinking water over time. It also has antimicrobial properties that help reduce the growth of harmful bacteria in the water supply, enhancing safety for consumers.

Additionally, copper has excellent thermal conductivity and can withstand high temperatures and pressures, making it a durable choice for both hot and cold water supply lines. Its flexibility allows for ease in installation, especially in tight spaces or areas where piping must navigate around obstacles.

In contrast, while materials like PVC and polyethylene have their uses in plumbing systems, they are typically not recommended for hot water applications or long-term exposure to sunlight without UV protection, which can lead to degradation. Steel, although strong, may require protective coatings to prevent rust and corrosion when used in water applications, which adds complexity to its use in potable water systems. Hence, copper remains a preferred choice in many plumbing standards for potable water distribution.