Environmental

Colorado's 'Arsenic Rule' for public water systems requires:

AA. All public water systems to maintain arsenic levels below 10 ppb (parts per billion)✓ Correct
BB. Only rural water systems to test for arsenic
CC. Arsenic testing only in properties built before 1980
DD. Arsenic is not a regulated contaminant in Colorado

Explanation

Colorado follows the federal EPA's Maximum Contaminant Level (MCL) for arsenic in public water systems of 10 parts per billion. Colorado has areas with naturally occurring arsenic in groundwater.

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