1930s–1940s|Discovery of PFAS
Scientists discover the exceptional stability of carbon–fluorine bonds, laying the foundation for PFAS chemistry.

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Scientists discover the exceptional stability of carbon–fluorine bonds, laying the foundation for PFAS chemistry.
Large-scale industrial production begins. PFAS are used in nonstick cookware, stain repellents, and industrial applications.
PFAS use expands into consumer products, textiles, food packaging, and firefighting foams (AFFF), including military use.
Researchers begin detecting PFAS in human blood and wildlife, indicating widespread environmental persistence.
Independent studies link PFAS exposure to cancer, immune system effects, and developmental harm. Regulatory attention increases.
Major manufacturers agree to phase out PFOS and PFOA in the United States, while replacement PFAS enter the market.
Some states begin adopting their own drinking water standards and cleanup requirements, often ahead of federal rules.
Federal rulemaking accelerates, PFAS are targeted for hazardous substance designation, and large settlements signal growing corporate accountability.