What material is commonly avoided in potable water supply systems due to corrosion and health concerns?

Galvanized steel is commonly avoided in potable water supply systems primarily due to its susceptibility to corrosion and potential health concerns. Over time, the zinc coating of galvanized steel can deteriorate, leading to rust formation, which not only affects water quality by introducing particles into the water supply but may also result in reduced water flow due to the buildup of rust scales inside the pipes. Furthermore, when galvanized pipes corrode, they can leach lead into the water if the water is slightly acidic or has low mineral content, posing significant health risks.

In contrast, materials like plastic, copper, and PEX are generally considered safer and more stable for potable water systems. Plastic piping is resistant to corrosion and does not leach harmful substances. Copper, while more expensive, also has antimicrobial properties and is resistant to corrosion when installed correctly. PEX is flexible, resistant to scale and chlorine, and does not corrode, making it a popular choice for modern plumbing systems.