Read the full story from NPR.
In some parts of the country people are learning their drinking water contains pollution from a group of chemicals called Per- and Polyfluoroalkyl Substances (PFAS). These chemicals have been linked to illnesses, including cancer. But a lot of questions remain including how exactly they affect people’s health and in what doses.
These chemicals have been around for decades but the issue gained urgency in recent years as water suppliers tested for and found PFAS pollution as part of an Environmental Protection Agency program.
The EPA is working on a plan to manage PFAS but members of Congress are pushing the EPA to move faster. A few states already have established strict new standards to limit the compounds in drinking water. And in some places, such as the Philadelphia suburbs, PFAS pollution has become an issue in mid-term election races.
As scientists and policy-makers work to limit human exposure to the compounds here are a few key points that are worth knowing.