Copper
A metal that can dissolve into water from copper plumbing, especially in new homes or where water is acidic.
ADWG Guideline
2 mg/L
Copper in drinking water primarily comes from corrosion of copper pipes and fittings rather than from the source water. New copper plumbing is particularly susceptible until a protective patina forms.
Why it matters
The ADWG sets a guideline of 2 mg/L. Copper at elevated levels can cause:
- Blue-green staining on sinks, baths, and blonde hair
- Metallic taste above 1 mg/L
- Gastrointestinal upset (nausea, vomiting) at levels well above the guideline
Risk factors
- New copper plumbing (first 1–2 years before patina develops)
- Low pH (acidic) water accelerates copper dissolution
- Water that has been stagnant in pipes for extended periods
Reducing copper levels
Running the tap for 30 seconds before use after extended periods of non-use flushes the most concentrated water from the pipes.
Check Your Water
See how copper levels compare in your suburb with real water quality data.
Disclaimer: Glossary definitions are provided for general educational purposes only and do not constitute medical advice or professional guidance. For specific health concerns about your drinking water, consult a qualified health professional. See our Terms of Use.