What is the MCL for copper in drinking water?

The maximum contaminant level (MCL) for copper in drinking water is set at 1.3 mg/L. This regulation is established to protect public health, as excessive amounts of copper can lead to various health issues, including gastrointestinal distress and liver or kidney damage. The 1.3 mg/L limit is based on the potential health risks associated with long-term exposure to elevated levels of copper.

This specific value reflects an effort to balance the need for safe drinking water while allowing for the natural occurrence of copper and the use of copper pipes in plumbing systems. Monitoring these levels is crucial to ensure that water suppliers provide safe drinking water that complies with established standards.