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The Chemical Contaminants were regulated in phases, which are collectively referred to as the Chemical Phase Rules. These rules regulate over 65 contaminants in three contaminant groups: Inorganic Contaminants (IOCs), Volatile  Organic Contaminants (VOCs), and Synthetic Organic Contaminants (SOCs). The rules apply to all public water systems (PWS).  PWS type, size, and water source determine which contaminants require monitoring for that system.  

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