On February 12, 2026, the U.S. Environmental Protection Agency (EPA) released a major update to its national drinking water monitoring data under the Fifth Unregulated Contaminant Monitoring Rule (UCMR 5). This dataset, representing nearly 95% of the monitoring results collected through 2025, gives the most comprehensive snapshot yet of the prevalence of per- and polyfluoroalkyl substances (PFAS) in America’s public water systems.