New York City Master Plumbers Practice Exam 2025 - Free Plumber License Practice Questions and Study Guide

Copper is commonly used for potable water distribution in plumbing systems due to its unique properties that make it suitable for carrying drinking water. It is naturally resistant to corrosion, which is crucial for maintaining water quality and ensuring the longevity of the plumbing system. Additionally, copper has antimicrobial properties, which help to minimize the risk of bacterial growth in the water supply.

Copper's durability allows it to withstand high temperatures and pressures, making it an ideal choice for both hot and cold water lines. Its flexibility in installation, combined with its ability to be soldered or joined using various methods, contributes to its popularity among plumbers.

Other materials, while used in plumbing, do not have the same combination of safety, durability, and historical trust in drinking water applications as copper does. For instance, cast iron is typically used for drainage systems rather than potable water due to its weight and risk of rusting. PVC is primarily used for drainage and waste systems, although it can be used for cold water applications, it is not as commonly accepted for potable water distribution. Galvanized steel, while historically used for water supply, has fallen out of favor due to concerns over rust and corrosion that can contaminate the water.