Contamination map shows (in blue) where water systems have detected the chemicals and (in red) where contamination sites have been identified or suspected.
Credit: ENVIRONMENTAL WORKING GROUP/NORTHEASTERN UNIVERSITY
The PFC/PFOA

Some 15 million Americans across 27 states are drinking water that could be contaminated with potentially carcinogenic man-made chemicals without even realizing it.

According to a new analysis and map released Thursday by the Environmental Working Group and scientists at Northeastern University, perfluorochemicals (PFCs) — a class of chemicals including perfluorooctanoic acid (PFAS) and perfluorooctane sulfonate (PFOS) — were detected in 162 U.S. drinking water systems in recent Environmental Protection Agency testing.

The toxic chemicals have been used over the years in a wide range of consumer products, like certain types of nonstick cookware, cleaning products and waterproof clothing, and have been linked to a number of health concerns 

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