Copper

Copper is an essential element for plants, animals, and humans. When present in drinking water in levels over one milligram per liter, it may cause a bitter taste, or green-blue stains on sinks.

Drinking Water Standard and Health Risks

Copper is a gastrointestinal irritant and can be toxic at high levels. However, the levels in drinking water are rarely high enough to cause a serious risk. A one milligram per liter secondary drinking water standard is set to indicate a taste problem, not a health hazard.

Possible Source of Contamination

Since copper is found only in trace amounts in Maine’s ground waters, excess levels are usually caused by the corrosion of copper pipes from soft, acidic waters.

Correcting the Problem

Copper caused by corroding of pipes will tend to be more concentrated in early morning because the water stands all night in the pipes. Reduce the concentrations by letting the water run for several minutes before using for cooking or drinking. Equipment for pH control will reduce the acidity of water so that less copper is dissolved. Contact a water treatment specialist; or change to plastic pipe of a type approved for hot water. See the yellow pages under "Water Treatment" for the name of a water treatment company in your area.

IF YOU HAVE QUESTIONS OR NEED ADVICE ON HOW TO CORRECT THE PROBLEM, CONTACT THE HEALTH AND ENVIRONMENTAL TESTING LABORATORY AT 207-287-1716.