Copper occurs naturally in small amounts in many waters and is generally not a problem.  Corrosion of copper-containing alloys in pipe fittings may introduce measurable amounts of copper into the water causing blue or green stains, corrosion of faucets, leaks in pipes, premature failure of hot water heaters and metallic tastes.  Higher levels of copper can poison red blood cells and cause jaundice, pancreatitis and hemolytic anemia.  Copper above 3 ppm can result in gastrointestinal reactions.

Acceptable results:  Less than 0.5 ppm.

Sources:  Naturally and corrosion of copper-containing alloys in pipe fittings.

Recommended testing:  Annually if water is considered corrosive or if blue or green stains are detected in plumbing fixtures.