What is the action level for copper in drinking water?

The action level for copper in drinking water is set at 1.3 ppm (parts per million). This means that if more than 10% of tap water samples collected during a monitoring period exceed this level, it indicates a potential issue with copper levels in the water supply and may necessitate further actions to reduce exposure. This standard is established by the Environmental Protection Agency (EPA) and is based on studies that evaluate health impacts, particularly concerning children's development and digestive health. Recognizing this threshold helps water operators ensure safe drinking water quality and protect public health.