| http://www.w3.org/ns/prov#value | - Action Level (AL): the concentration of a contaminant which, when exceeded, triggers treatment or other requirements which a water system must follow: n/a: not applicable n/d: not detectable at testing limit ppb: parts per billion or micrograms per liter ppm: parts per million or milligrams per liter pCi/l: picocuries per liter (a measure of radiation) TT: Treatment TechniqueWater Quality Data Exp
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