On May 14, 2020, the EPA indicated it will not be imposing any limits on perchlorate, a chemical compound the EPA previously characterized as “a persistent contaminant of concern.” Perchlorate can be man-made or it can form naturally in the atmosphere in arid states in the Southwest U.S., in large deposits of sodium nitrate fertilizer in Chili, and in potash ore in the Northwest and Canada. Manufactured perchlorate is used in rocket propellant, munitions, explosives, fireworks, road flares, and in food containers and equipment that …
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