What is the recommended pipe material for underground water supply lines?

The recommended pipe material for underground water supply lines is PVC or polyethylene due to several key advantages. These materials are lightweight, resistant to corrosion, and have excellent chemical resistance, making them ideal for use in various soil conditions where they won't degrade over time. PVC has a smooth interior surface, which helps reduce friction loss and allows for efficient water flow while also being cost-effective. Polyethylene is flexible, which makes it easier to install in irregular ground conditions, as it can bend without breaking.

In addition, both PVC and polyethylene can withstand typical pressures found in residential and commercial water systems, ensuring reliability and safety. They don't rust or corrode, which is particularly important because underground pipes can be exposed to moisture and other corrosive materials present in the soil. This durability leads to a longer lifespan compared to other materials, minimizing repair costs and disruptions.

Other materials, such as steel and galvanized iron, tend to suffer from corrosion and rust over time when buried underground, which can lead to leaks and reduced water quality. Copper, while durable, is more expensive and also somewhat susceptible to corrosion in certain conditions, making it less practical for all underground applications.