| http://www.w3.org/ns/prov#value | - MCLGs allow for a margin of safety.Action Level (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.Treatment Technique (TT): A required process intended to reduce the level of a contaminant in drinking water.Non-Detects (ND): Laboratory analysis indicated that the constituent is not present.Milligrams per liter (mg
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