Like grease that won't wash out of a pan, PFAS can stick around long after the original spill, use, or discharge is over. PFAS contamination means the presence of per- and polyfluoroalkyl substances - often called "forever chemicals" - in water, soil, air, food packaging, firefighting foam, or the human body at levels that may create health or property risks. Legally and for insurance purposes, the phrase usually comes up when someone claims exposure caused illness, lowered property value, required cleanup, or triggered a duty to warn, monitor, or compensate.

In practice, these claims often turn on proof of exposure and timing. PFAS cases can involve toxic tort claims, negligence, product liability, premises liability, or disputes over insurance coverage for cleanup costs. Medical records, water test results, employment history, and expert opinions matter because PFAS-related harm may develop slowly and can be hard to trace to one source - never the easiest file on the desk.

For an injury claim in New York, the details of where the PFAS came from and when exposure happened can shape causation, damages, and filing deadlines under the statute of limitations. New York also set drinking water Maximum Contaminant Levels for PFOA and PFOS at 10 parts per trillion in 2020 through the New York State Department of Health. Those standards do not automatically prove liability, but they can become key evidence in showing contamination, notice, and the reasonableness of a cleanup or health-monitoring claim.