Zinc

 

Drinking Water Standard and Health Risks

The secondary drinking water standard for zinc is 5 milligrams per liter. Zinc levels above this standard may give water a chalky appearance and bad taste. The presence of zinc in drinking water does not generally present health risks and in small amounts is essential to health.

Possible Source of Contamination

Zinc can occur naturally in drinking water. Zinc contamination can result from corrosion of galvanized pipes by soft, acidic water. Zinc is used in fertilizers and may be found in landfill leachate or in industrial wastes.

Correcting the Problem

Water contaminated with metals may be safe to drink for a short time, but over a long period is more hazardous and should not be used. Lead and cadmium 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. Corrosion of pipes can be controlled by neutralizing the acidity of the water. Contact a water treatment specialist.

Water contaminated with metals from landfill leachates and industrial discharges are special cases and metals may or may not be able to be removed from the water. Contact a water treatment specialist. They are listed in the yellow pages under "Water Treatment".

IF YOU HAVE PROBLEMS OR NEED ADVICE ON HOW TO CORRECT A PROBLEM, PLEASE CONTACT THE HEALTH & ENVIRONMENTAL TESTING LABORATORY AT (207) 287-1716.