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A new statewide survey shows that 23 Colorado cities have aging lead water delivery pipes, roughly 20,000 of them, that could potentially taint drinking water. Under federal rules, those cities must identify all contaminated pipes and replace them by 2037, according to the Colorado Department of Public Health and Environment.

A controversial 53-year-old plan to build a major dam above Lyons is drawing renewed attention as a northern Colorado water district seeks to maintain its right to use the water associated with the long-dormant project.