Dive into 2026 with the GWWI Water Lab Analyst Exam – Test Your Flow and Make a Splash!

The action level for lead in drinking water is set at 0.015 mg/L, or 15 parts per billion (ppb). This value is established by the U.S. Environmental Protection Agency (EPA) under the Lead and Copper Rule. When the concentration of lead in water exceeds this level, water systems are required to take action to control lead levels, which may include corrosion control treatment, public education, and lead service line replacement.

Maintaining lead levels below this action level is crucial for public health, especially for vulnerable populations such as children and pregnant women, as lead exposure can have severe developmental impacts and other health effects. Understanding this standard is essential for water lab analysts, as it helps ensure compliance with regulations designed to protect drinking water quality.