Concentrations of Per- and Polyfluoroalkyl Substances (PFAS) and Other Chemical Constituents for Groundwater and Surface-Water Samples on Cape Cod, Massachusetts, 2019-2024

Groundwater, surface-water, and associated quality assurance samples were collected across western Cape Cod, Massachusetts and analyzed for per- and polyfluoroalkyl substances (PFAS) from September 2019 through November 2024. Water-quality properties measured at the time of sample collection included pH, specific conductance, temperature, and dissolved oxygen. Samples were also analyzed for other chemical constituents including major and selected minor inorganic constituents, nutrients, and pharmaceuticals. This data release contains three files, data dictionary and two datasets in tabular format:

1) DataDictionary_CapeCodPFAS_2019_2024.csv -- Definitions for parameters in each table.
2) CapeCodPFAS_2019_2024.csv -- Location information, field properties, and laboratory results for inorganic constituents, nutrients, and PFAS.
3) CapeCod_Pharmaceuticals_June2022.csv -- Site information and pharmaceutical results for a subset of samples collected at the Quashnet River in June 2022.