By now, you’ve probably heard of PFAS, short for per- and polyfluoroalkyl substances. These manufactured chemicals have been used for almost a century to make everyday products more durable and resistant to water and stains. The issue is that PFAS don’t break down easily in the environment or in the human body. Hence the name: forever chemicals . PFAS are also more common than most people realize.  Roughly 7 million Americans are exposed to PFAS in their drinking water. Here’s how you can