
By Michael DiGiannantonio
The U.S. EPA has released its proposed maximum contaminant levels (MCLs) for Perfluorooctanoic acid (PFOA) and Perfluorooctane sulfonate (PFOS) - two common types of per- and polyfluoroalkyl substances (PFAS). Under the proposed MCLs, drinking water utilities across the country would be forced to respond if concentrations are found in excess of 4 parts per trillion (ppt) by either taking the contaminated sources out of service or treating the contaminated sources.
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