What is the MCL standard for copper concentration in drinking water?

The maximum contaminant level (MCL) for copper in drinking water is set at less than 1.3 mg/L. This standard is established by the Environmental Protection Agency (EPA) to protect public health, particularly for vulnerable populations such as children and pregnant women. High levels of copper can lead to various health issues, including gastrointestinal distress and long-term effects on the liver and kidneys. Therefore, the MCL is a safety threshold designed to minimize exposure to copper while ensuring the safety and quality of drinking water.

The determination of this level took into consideration factors such as the potential sources of copper, which can include corrosion of plumbing systems and leaching from copper pipes. The MCL is critical for water utilities to monitor and manage copper levels, ensuring they remain below this threshold for safe consumption.