What is the primary source of lead in drinking water?

The primary source of lead in drinking water is the corrosion of plumbing systems. Over time, lead pipes, solder, and brass fixtures can corrode, especially when water is acidic or has low mineral content. This corrosion allows lead to leach into the water supply, which can subsequently be consumed by households.

Overall, many water systems that were built before the 1980s may still contain lead pipes or lead solder, and when these materials corrode due to factors such as water chemistry or age, lead can be released into the drinking water. Therefore, the condition and composition of internal plumbing systems are critical to understanding lead exposure risks in drinking water.