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Lead and copper in municipal water systems present a major health hazard in addition to the infrastructure loss associated with corrosion releasing them into the distribution system. Soluble lead and copper became a legal as well as economic concern with the implementation of the Lead and Copper rule in the United States in 1991 and its subsequent expansion. Similar regulations where implemented in Canada during the same time period. The regulations set action limits for the metals at 15 µg/L for Pb and 1.3 mg/L for Cu.
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