Report: 15 Million Americans' Drinking Water Tainted By Toxic Chemical

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.