What is the quality standard for copper in drinking water?

What is the quality standard for copper in drinking water?

• A. 0 mg/L
• B. 1.3 mg/L
• C. 3.0 mg/L
• D. 0.5 mg/L

Answer: (B)

Copper in drinking water has a regulatory quality standard of 1.3 mg/L. This maximum contaminant level, set by the EPA, is the limit water systems must not exceed to protect health and maintain acceptable taste and appearance. Copper can enter water from copper plumbing and fixtures, especially when water chemistry is corrosive, so keeping levels at or below 1.3 mg/L helps prevent acute effects like gastrointestinal distress and reduces risks from long-term exposure. The other numbers aren’t the established standard: 0 mg/L would imply no copper at all, which isn’t the regulatory target; 3.0 mg/L is above the allowed limit; 0.5 mg/L is below the standard. So the correct standard is 1.3 mg/L.

Copper in drinking water has a regulatory quality standard of 1.3 mg/L. This maximum contaminant level, set by the EPA, is the limit water systems must not exceed to protect health and maintain acceptable taste and appearance. Copper can enter water from copper plumbing and fixtures, especially when water chemistry is corrosive, so keeping levels at or below 1.3 mg/L helps prevent acute effects like gastrointestinal distress and reduces risks from long-term exposure. The other numbers aren’t the established standard: 0 mg/L would imply no copper at all, which isn’t the regulatory target; 3.0 mg/L is above the allowed limit; 0.5 mg/L is below the standard. So the correct standard is 1.3 mg/L.