Toxic PFAS found in U.S. drinking water 2023, by location
The Environmental Protection Agency has proposed regulating certain PFAS, such as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), at four ppt. These "forever chemicals" have been used in the U.S. since the 1940's to manufacture everyday items. They have been linked with cancer and birth defects and have been found in blood samples.