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Health Effects Language <br /> Copper is an essential nutrient, but some people who use water containing copper in excess of the action level over a relatively short <br /> amount of time may experience gastrointesteinal distress. Some people who drink water containing copper in excess of the action level <br /> over many years may suffer liver or kidney damage. People with Wilson's Disease should consult their personal doctor. <br /> Section: Drinking Water Interpretations Page 5 of 8 Page 5 of 8 <br />