The EPA has set a goal for copper at a maximum allowable level of 1.3 mg per liter of drinking water to protect against short-term gastrointestinal tract problems. However, some states have difficulty in maintaining copper levels below this goal. Because some recent population studies have reported no adverse health effects from ingesting copper at higher concentrations, questions have been raised about the validity of the science on which the EPA based its goal for drinking water. In response to these concerns, Congress asked the National Research Council for an independent review of the scientific and technical basis for the EPA s goal for copper in drinking water. Too much copper can cause several health problems, the committee said.
Excessive doses can cause nausea, vomiting and diarrhea.
Long-term exposure can lead to copper poisoning, especially in people whose bodies have trouble regulating copper because of certain genetic disorders or illnesses, such as Wilson s disease. Severe cases of copper poisoning have lead to anemia, liver poisoning and kidney failure. We assume this level is protective to people with chronic disease as well. But we need more information about the total copper doses received from drinking water, along with a better idea of how many people are sensitive to copper and what happens to them when they are exposed. Once this information has been gathered, the current level should be reevaluated.