What is the action level for copper in drinking water?

• A. 0.5 mg/L
• B. 1.0 mg/L
• C. 1.3 mg/L
• D. 2.0 mg/L

Answer: (C)

The action level for copper in drinking water is set at 1.3 mg/L. This threshold is established by the Environmental Protection Agency (EPA) as part of the Lead and Copper Rule, which aims to control the levels of these metals in public drinking water supplies. When the concentration of copper in drinking water exceeds this action level, water systems are required to take specific measures to reduce copper levels, which may include optimizing corrosion control treatment or replacing lead service lines.

Copper is essential in small amounts for human health, as it plays a role in various bodily functions, including the formation of hemoglobin and the maintenance of nerve cells. However, elevated levels can cause health issues, including gastrointestinal distress and, in extreme cases, liver or kidney damage. Therefore, monitoring and regulating the copper concentration in drinking water is crucial to ensuring public health and safety.