What is the action level set for copper in drinking water?

The action level for copper in drinking water is set at 1.3 mg/L according to the Environmental Protection Agency (EPA) regulations under the Lead and Copper Rule. This level is established to protect public health and minimize the risk of copper exposure, which can lead to health issues such as gastrointestinal distress and liver damage when present in high concentrations. If the copper concentration exceeds this action level in more than ten percent of the tap water samples collected, water systems are required to take specific actions, including providing treatment to reduce copper levels and communicating the potential risks to consumers. This regulation is crucial for ensuring the safety and quality of drinking water supplied to the public.