ABC Online | PFAS chemicals: Katherine residents want answers on contamination in water supply, pool ABC Online "Who knows how high these [chemical] levels have been for my kids' whole lives, and the majority of my life?" Merlyn Smith, a mother of two, said. It is per-and poly-fluoroalkyl substances, also known as PFAS chemicals, that have made her so fearful. Katherine residents "petrified" about PFAS water contamination |