Over 500 US airports face multi-million-dollar PFAS contamination liability from decades of mandatory AFFF firefighting foam use, with EPA's 2024 CERCLA designation making them strictly liable for cleanup

For decades, the FAA required airports certificated under 14 CFR Part 139 to use AFFF (Aqueous Film-Forming Foam) containing PFAS 'forever chemicals' for aircraft rescue and firefighting operations and training. In April 2024, the EPA designated PFOS and PFOA as hazardous substances under CERCLA (Superfund), making airports strictly liable for PFAS contamination of groundwater, soil, and neighboring properties -- even though the airports were following federal mandates. The FAA Reauthorization Act of 2024 authorized $350 million over 5 years for PFAS transition, but the House Appropriations Committee initially approved only $5 million. Why it matters: Airports are now legally liable as 'sources' of PFAS contamination under CERCLA strict liability, so they face remediation costs potentially exceeding $10-50 million per site for groundwater treatment, soil removal, and equipment decontamination, so airport operators must simultaneously fund cleanup of legacy contamination AND purchase new PFAS-free fluorine-free foam (F3) systems AND replace or decontaminate decades of AFFF-contaminated ARFF vehicles and equipment, so smaller airports with limited budgets face existential financial pressure that could force service reductions, so neighboring communities with contaminated drinking water are filing lawsuits against airports that were simply complying with FAA requirements. The structural root cause is that the FAA mandated AFFF use for decades without studying or disclosing the environmental persistence of PFAS, the EPA's 2024 CERCLA designation retroactively imposed strict liability without a corresponding federal funding mechanism to cover the costs, and the massive gap between the authorized $350M and appropriated $5M reflects Congress's unwillingness to fund the consequences of its own regulatory mandates.