PFAS are non-aromatic, organic chemicals in which the hydrogen atoms in the carbon chain are fully replaced (“per”) or partly but almost entirely replaced (“poly”) by fluorine atoms. At least 4,700 substances belong to this group of substances. All these chemicals have in common that their environmental degradability is fairly slow and very limited and therefore remain resistant for years to decades.PFAS are “forever chemicals.” Even when being incinerated for disposal, very high temperatures are required for these compounds to