Study: Public Water Supply is Unsafe for Millions of Americans

Millions of Americans may be drinking water with unsafe levels of industrial chemicals, according to a study published Tuesday in the journal Environmental Science & Technology Letters. These chemicals, known as polyfluoroalkyl and perfluoroalkyl substances or PFASs, have been linked to high cholesterol, obesity, hormone suppression — and even cancer. Introduced more than 60 years ago, PFASs are a category of man-made chemicals that degrade very slowly, if at all, in the environment.