New ‘forever chemicals' contaminating the environment, regulators say

Earlier this year, federal and state researchers reported finding a new, potentially dangerous chemical in soil samples from multiple locations in New Jersey. The compound was a form of PFAS, a group of more than 5,000 chemicals that have raised concerns in recent years because of their potential link to learning delays in children and cancer, as well as their tendency to last in the environment for a long time. 

But the new revelations, reported in the June issue of Science magazine, stoked concerns among water-quality researchers and advocacy groups for other reasons, too. It underscored how easy it is for manufacturers to phase out their use of PFAS (per- and polyfluoroalkyl substances) once the substances have been regulated, and replace them with newer, related compounds that researchers know even less about. And it showed how difficult it is for regulators to track and oversee these new compounds.
https://www.theguardian.com/us-news/2020/oct/01/new-forever-chemicals-contaminating-environment-regulators-say