Off topic, but you can think of PFAS as micro plastics at the molecular level.

We humans can metabolize/excrete the shorter ones (common in food wrappers, cosmetics, fire fighting foam) over months to years, but the longer ones (mostly banned in the 2010's IIRC) are usually never metabolized and slowly build up in the body and mess things up. Like cancer rates near DuPont GenX factories or fire fighters having higher rates of testicular cancer.

TLDR: PFASes are bad, NZ is doing a good thing. Not sure if we have replacement chemicals for PFAS yet, but I hope so