| http://www.w3.org/ns/prov#value | - MCLG's allow for a margin of safety. (3) Treatment Technique: TT: A required process intended to reduce the level of a contaminant in drinking water. (4) Action Level (AL) The concentration of a contaminant which triggers a treatment or other requirement which a water system must follow. (5) ppm: parts per million or milligrams per liter (6) ppb: parts per billion or micrograms per liter (7) The M
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