Majority of US Waterways Contaminated by Cancer-Linked ‘Forever Chemicals,’ Analysis Reveals

Per- and Polyfluoroalkyl substances (PFAs) have been used in many consumer and industrial products since the 1940s. Often used to make products water-resistant, they break down very slowly over time and tend to build up in both the human body and the environment. PFAs have been linked to cancer and disease in humans.