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Water: Chemical Contaminant Rules

Chemical Contaminant Rules

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.  

  • Basic Information - Provides explanation of the purpose of the chemical phase rules and links to chemical fact sheets.
  • Compliance Help - Provides guidance documents and materials to assist drinking water systems and primacy agencies with implementation of the chemical phase rules.

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