PFAS Statewide Sampling Dataset

This repository contains a representative sample of U.S. community water systems (CWS) included in the PFAS statewide sampling dataset. In the first versions of this dataset, 18 states were included. The statewide sampling dataset now compiled data from 24 U.S. statewide sampling campaigns of CWS for per- and polyfluoroalkyl substances (PFAS) in drinking water. Samples span the 2016-2023 period. All data were either publicly available or provided by state agencies upon request. All data were either publicly available or provided by state agencies upon request. The full dataset contains approximately 58,000 samples from 9,950 CWS in Alabama, Arizona, California, Colorado, Georgia, Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, South Carolina, Utah, Vermont, Washington, and Wisconsin. Concentrations of 5-40 targeted PFAS were analyzed by multiple labs contracted by the states using comparable methods, including either US EPA Method 537, 537.1, or 533. We assigned a conservative, uniform detection limit at the 98th percentile of all reports detection limits (5 ng/L) for the 5 PFAS that were measured in all states consistently. Please contact Jahred Liddie ([e-mail]) for questions/suggestions, access to additional variables, or access to the full sampling dataset.