| http://www.w3.org/ns/prov#value | - for a contaminant for which EPA has set a treatment technique or an action level must include one or both of the following definitions as applicable: (i) Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water; (ii) Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must
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