Among the worst of the toxic chemicals found in consumer products are “perfluorochemicals” also known by various acronyms: PFAS, PFOA, PFOC, PFCs. They have slippery, heat-resistant properties that are used to repel water and stains and make non-stick coatings. Used in many common products, scientific evidence confirms these chemicals join PCBs, DDT, and dioxins as among the most persistent and toxic chemicals ever created. They are found across the globe, in all environments tested, including in biomonitoring studies of human tissues, including breastmilk, and will take hundreds if not thousands of years to disappear from the soil and groundwater where they accumulate. Animal studies demonstrate links to several cancers and toxicity to reproduction and the immune system. These chemicals should be banned.