Copper in Drinking Water

EPA Limit: 1.3 mg/L (action level)

Copper is regulated under the EPA's Lead and Copper Rule. When copper levels exceed 1.3 mg/L in more than 10% of tap water samples, the water system must take steps to control corrosion.

Where Does Copper Come From?

Copper enters drinking water through corrosion of copper plumbing, pipes, and fittings. Homes with newer copper pipes are often most affected as the pipes have not yet developed a protective mineral coating.

Health Risks

Short-term exposure above the action level can cause gastrointestinal distress including nausea, vomiting, and diarrhea. Long-term exposure may cause liver or kidney damage. People with Wilson's disease are especially sensitive.

What Should I Do?

Flush cold water for 30 seconds to 2 minutes before use, especially in the morning. If your water has a metallic taste or blue-green staining, consider having it tested. Filters certified under NSF/ANSI Standard 53 can reduce copper levels.