What is the action level for copper in mg/l?

The action level for copper, established by the U.S. Environmental Protection Agency (EPA) under the Lead and Copper Rule, is set at 1.3 mg/l. This means that if the concentration of copper in drinking water exceeds this level in more than ten percent of the tap water samples collected over a specific time period, water systems must take action to reduce copper levels. This threshold reflects the potential health risks associated with elevated copper exposure, particularly for vulnerable populations such as children and pregnant women. Thus, understanding this action level is critical for water operators to ensure compliance with regulatory standards and to protect public health.