| http://www.w3.org/ns/prov#value | - for a margin of safety.ppb -- parts per billion.ppm -- parts per million.pCi/L ??? picocuries per literN/A ??? Not applicableND -- Not detectedTreatment Technique (TT) ??? A required process intended to reduce the level of a contaminant in drinking water.Action Level (AL) ??? The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must f
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