Environmental

Colorado's 'fluoride in water' regulation relates to real estate in that:

AA. All Colorado properties must fluoridate their water supply
BB. Buyers of properties with private wells should test water quality, including fluoride levels, since well water may have naturally occurring fluoride at varying levels✓ Correct
CC. Colorado prohibits fluoride in municipal water systems
DD. Fluoride is only regulated in commercial buildings

Explanation

Properties with private wells are not regulated by the EPA's Safe Drinking Water Act (which applies to public water systems). Buyers should test private well water for a range of potential contaminants, which may include naturally occurring fluoride, nitrates, arsenic, bacteria, and radon in water, depending on the local geology.

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