Water pouring from the faucets of at least 42 million Americans is contaminated with unacceptable levels of “forever chemicals,” according to a USA TODAY analysis of records the Environmental Protection Agency released June 2. Per- and polyfluoroalkyl substances, or PFAS, are a family of chemicals engineered to be nearly indestructible. Studies have shown they can accumulate over time in human bodies, leading to certain cancers and other health complications.