PFAS in firefighting foam is one of the most active areas in chemical exposure liability. The foam—often called AFFF—was used for decades at airports, military bases, fire training grounds, refineries, and industrial sites. It put out fuel fires quickly. It also contained per- and polyfluoroalkyl substances that do not break down easily and move readily through soil and groundwater. Those two facts create a straightforward liability problem: widespread use, persistent contamination, and a growing record of health and property damage claims.
The core claim is simple. A property owner, water utility, resident, or worker alleges that PFAS from foam entered their land, water, or body and caused harm or costly cleanup. The strongest cases usually do not depend on proving that a single foam manufacturer acted with intent. They depend on showing that PFAS was released, that it traveled, that it reached the claimant’s property or water supply, and that the contamination caused measurable loss. In many cases, the loss is cleanup cost. In others, it is lost property value, lost use of water, testing costs, or personal injury.
Airports and municipalities face particular exposure because they often owned or controlled the places where foam was stored, used, or spilled. A city that ran a fire training site may face claims from neighboring homeowners whose wells test positive for PFAS. An airport authority may face claims from a water utility that had to shut down a well field. A county may face claims from residents who claim years of exposure. The fact that the foam was purchased and used for legitimate fire safety does not automatically end the liability. The question is often whether the operator knew or should have known about the risks, whether it handled the foam carelessly, and whether it caused contamination that reached others.
Property owners and developers can also get pulled into PFAS claims. A site that once hosted fire training may carry contamination that was never disclosed during a sale. A landlord may face tenant claims over contaminated water. A developer may discover PFAS in soil or groundwater after buying land for a new project. These cases often turn on what was known, what was tested, and what was said during the transaction. Old environmental reports that never looked for PFAS are a common problem. PFAS testing is specialized, and a clean report from twenty years ago does not prove a site is clean today.
The evidence fight is central. Claimants need sampling data that links the foam to the contamination. Defenders point to other possible sources, such as manufacturing facilities, wastewater, landfills, or consumer products. They also attack the health evidence, arguing that the science does not prove that a specific exposure caused a specific illness. Courts have become more familiar with PFAS science, but the battle over causation remains expensive and fact-heavy. That is why many PFAS cases settle rather than go to trial. The costs of testing, expert reports, and years of litigation can push both sides toward a resolution.
Regulation is raising the stakes. Federal and state agencies have set drinking water limits and cleanup standards for certain PFAS. When a regulator orders a water utility or property owner to test, treat, or clean up, that order often becomes the backbone of a liability claim. The cost is no longer theoretical. It is a bill with a number. Claimants can use regulatory findings to show that contamination exists and that cleanup is required. Defendants can use the same record to argue that they acted responsibly or that the cleanup is being handled by regulators.
For airports, municipalities, and property owners, the practical response is early investigation. Find out where foam was used, stored, and disposed of. Check old fire training records. Test soil and groundwater at likely release points. Notify insurers and review coverage. Preserve documents. Identify nearby wells and water systems. Do not assume that a general environmental report covered PFAS. Do not assume that fire safety use is a complete defense. The claims are fact-specific, but the pattern is consistent: foam use, PFAS contamination, costly cleanup, and disputes over who pays. The party that documents the site early and understands its exposure is in a better position to defend a claim or negotiate a realistic resolution.
