Harvard researchers find that levels of a widely used class of industrial chemicals exceeds recommended safety levels in public water supplies for six million people in the U.S. The chemicalswater security 3—polyfluoroalkyl and perfluoroalkyl substances (PFASs)—have been linked with cancer, hormone disruption, high cholesterol, and obesity. Drinking water from 13 states accounted for 75 percent of the detections. Listed in order of frequency of detection, they are California, New Jersey, North Carolina, Alabama, Florida, Pennsylvania, Ohio, New York, Georgia, Minnesota, Arizona, Massachusetts, and Illinois. The number of people affected, however, could be much higher because government data for levels of these compounds in drinking water is lacking for almost a third of the U.S. population — about 100 million people. PFASs have been used for decades in products ranging from food wrappers to clothing to pots and pans and they can linger in groundwater even when manufacturers stop using the chemicals. See more here.