Unsafe levels of toxic chemicals found in drinking water for 6 million Americans

Levels of a widely used class of industrial chemicals linked with cancer and other health problems--polyfluoroalkyl and perfluoroalkyl substances (PFASs)--exceed federally recommended safety levels in public drinking water supplies for six million people in the U.S., according to a new study led by researchers from Harvard T.H. Chan School of Public Health and the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS).