Bridging Gaps for Ecological Assessment of PFAS Challenge Per- and polyfluoroalkyl substances (PFAS) are among the most widespread and persistent environmental pollutants. There are more than 3,000 PFAS chemicals in use for industrial and consumer applications, including firefighting foams, non-stick cookware, food packaging and water- and stain-resistant fabrics. In recent years, PFAS has come under wider scrutiny due to its persistence in the environment and potential risks to human health and the environment. An analysis of EPA monitoring data reported elevated levels of PFAS in groundwater and surface water used for public water supplies associated with industrial plants producing or using PFAS, military bases and airports used for firefighting exercises, and publicly owned treatment

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