| http://www.w3.org/ns/prov#value | - MCL's are set as close to MCLG's as feasible using the best available treatment technology. (AL) Action Level - The concentration of a contaminant which, if exceeded, triggers a treatment or other requirement which a water system must follow. ppb - parts per billion or milligrams per liter. ppm - parts per million or milligrams per liter pCi/liter - Pico curies per liter.
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