Known PFAS Contamination Sites

The unauthenticated nationwide ArcGIS layer can be filtered to records whose sampled matrix is explicitly identified as drinking water. Those records return a site or sampled-point label, state, WGS84 point geometry, year, PFOA/PFOS and total-or-reported PFAS concentration context in parts per trillion, and a testing-data link where supplied. Use only explicitly drinking-water records. The Source reports site-level maxima or reported levels and year rather than a public-water-system service area or complete sample-event analytical context, and it does not supply qualifiers, detection limits, methods, health-comparison values, compliance, or tap-level exposure.