PFAS concentrations in blood serum. This dataset is not publicly accessible because: Data is the property of the research leads (NC State University). It can be accessed through the following means: Contact Jane Hoppin of NC State University (jahoppin@ncsu.edu). Format: Data is quantitative measurements of blood serum levels for PFAS levels in human serum formated as MS Raw files and instrument vendor quantification files. This dataset is associated with the following publication: Kotlarz, N., J. McCord, D. Collier, C.S. Lea, M. Strynar, A. Lindstrom, A.A. Wilkie, J.Y. Islam, K. Matney, P. Tarte, M. Polera, K. Burdette, J. DeWitt, K. May, R.C. Smart, D.R.U. Knappe, and J.A. Hoppin. Measurement of Novel, Drinking Water-Associated PFAS in Blood from Adults and Children in Wilmington, North Carolina. ENVIRONMENTAL HEALTH PERSPECTIVES. National Institute of Environmental Health Sciences (NIEHS), Research Triangle Park, NC, USA, 128(7): 77005, (2020).

This data release provides concentration results for per- and polyfluoroalkyl substances (PFAS) collected by volunteer community members, in tapwater samples from 84 private residences, in select areas within the United States. Samples were collected July 1, 2023, through October 3, 2024. Samples were analyzed at the U.S. Geological Survey National Water Quality Laboratory (NWQL) in Denver, Colorado. Exact site location information for these sites is not available because of privacy concerns.

Summary statistics for PFAS measured in tap water, glass slab wipes, and house dust. Associated method and QC information. This dataset is associated with the following publication: Chang, N., C. Eichler, E. Cohen-Hubal, J.D.S. Jason D. Surratt, G. Morrison, and B. Turpin. Exposure to Per- and Polyfluoroalkyl Substances (PFAS) in North Carolina Homes: Results from the Indoor PFAS Assessment (IPA) Campaign. Environmental Science: Processes & Impacts. Royal Society of Chemistry, Cambridge, UK, 27(6): 1654-1670, (2025).

Data were collected at 19 groundwater monitoring wells and 3 surface water locations across McHenry County, Illinois, in 2020 by staff from the U.S. Geological Survey (USGS) Central Midwest Water Science Center. Quality control samples (2 blanks and 1 replicate) were also collected to assess data reliability and precision. Samples were submitted to the USGS National Water Quality Laboratory in Denver, Colorado, and were analyzed for per- and polyfluoroalkyl (PFAS) substances in late 2022 and results provided in April of 2023. PFAS were detected in 16 of the 19 groundwater monitoring wells and in all 3 surface water sites sampled.

Concentrations of inorganic constituents, dissolved organic carbon (DOC), tritium, per- and polyfluoroalkyl substances (PFAS), volatile organic compounds (VOCs), and pharmaceuticals were measured in groundwater samples collected from 254 wells in 2019 and 2020. Concentrations of inorganic constituents, DOC, VOCs, and pharmaceuticals were measured at the U.S. Geological Survey (USGS) National Water Quality Laboratory in Lakewood, Colorado. Concentrations of tritium were measured at the USGS Tritium Laboratory in Menlo Park, California. Concentrations of PFAS were measured at SGS Laboratory in Orlando, Florida. In addition, several geospatial parameters were determined, including: percentages of selected land uses within 500-meter buffers around sampled wells, nitrogen loading from septic systems within 500-meter buffers around sampled wells, distance to nearest wastewater treatment plant, and distance to selected industry and other potential point sources that could be sources of PFAS to the environment. The data were collected as part of the USGS National Water-Quality (NAWQA) project. This data release contains 12 tables of well information, laboratory results, geospatial output, and a data dictionary, including: 1) PFAS_Data_Dictionary.csv – Parameters in each table are defined in this table. 2) PFAS_BLANK.csv – Concentrations of PFAS in equipment, field, and source-solution blank samples. 3) PFAS_ENV.csv – Concentrations of PFAS in environmental samples. 4) PFAS_GEOSPATIAL.csv – Percentages of selected land uses within 500-meter buffers around sampled wells; nitrogen loading from septic systems within 500-meter buffers around sampled wells; distance to nearest wastewater treatment plant; distance to selected industry and other potential point sources that could be sources of PFAS to the environment. 5) PFAS_INORGANICS_AND_OTHER.csv – Concentration of inorganic constituents, DOC, and tritium. 6) PFAS_LAB_BLANK.csv – Concentrations of PFAS in laboratory blank samples. 7) PFAS_PHARMA.csv – Concentrations of pharmaceutical compounds in environmental samples. 8) PFAS_REP.csv – Concentrations of PFAS in replicate samples. 9) PFAS_SPIKE_FIELD.csv – Percent recovery for PFAS in field matrix-spike samples. 10) PFAS_SPIKE_LAB.csv – Percent recovery for PFAS in laboratory reagent-spike and matrix-spike samples. 11) PFAS_VOCs.csv – Concentrations of VOCs in environmental samples. 12) PFAS_WELLS.csv – Site characteristics of the sampled wells.

Per- and polyfluoroalkyl substances (PFAS) are chemicals of emerging concern that potentially pose risks to human and environmental health. In May–Oct 2018, sediment and passively collected surface water samples were collected from 62 tributary sites of the Laurentian Great Lakes with site catchments spanning gradients in land cover. Discrete samples of sediment and time-integrated surface water samples collected with polar organic chemical integrative samplers (POCIS) were analyzed for 23 and 34 PFAS, respectively. Concentrations of individual PFAS in sediment and surface water varied substantially among sites from below detection to 20,800 ng kg-1 and 247 ng L-1, respectively. Elevated PFAS concentrations occurred in urban watersheds and downstream of airports and wastewater treatment plants (WWTP). Of all target compounds, PFOS was the most frequently detected in sediment (56 of 62 sites) and had the highest median concentration (132 ng kg-1). PFOA, PFHxS, PFOS, PFHpA, and PFNA were detected in all 60 surface water sites, with median concentrations of 5.9, 5.2, 4.6, 3.7, and 1.3 ng L-1, respectively. Compounds with 8–14 fluorocarbons comprised a larger proportion of sediment PFAS than compounds with 4–7 fluorocarbons, whereas compounds with 4–7 fluorocarbons were dominant in surface waters. Watershed attributes, including urban land cover and WWTP flow fraction were positively related with PFAS sum concentrations in sediment and surface water. Collectively, these results highlight the relation PFAS occurrence has with human activities and documents widespread low-level PFAS contamination across the Great Lakes basin. This dataset is associated with the following publication: Loken LC, Corsi SR, Alvarez DA, Pronschinske MA, Lenaker PL, Nott M, Zhang C, Mani E, Ankley GT. Per- and polyfluoroalkyl substances (PFAS) in surface water and sediment in Great Lakes tributaries and relations with watershed attributes. In Review. This dataset is not publicly accessible because: It is inconsistent with established Federal practices for EPA to be the repository of data generated by the USGS. It can be accessed through the following means: All data will be completely accessible through the USGS and detailed instructions for its access will be described in the peer-reviewed journal article. Format: The data were generated by the US Geological Survey (USGS) who, like EPA, are required to make all their data publicly available through their open access website concurrent with publication of a paper. When this occurs, the data will be in a standard format, e.g., as spreadsheets with accompanying metadata. This dataset is associated with the following publication: Loken, L., S. Corsi, D. Alvarez, M. Pronschinske, P. Lenaker, M. Nott, C. Zhang, E. Mani, and G. Ankley. Per- and polyfluoroalkyl substances in surface water and sediment in Great Lakes tributaries and relations with watershed attributes. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY. Society of Environmental Toxicology and Chemistry, Pensacola, FL, USA, 44(6): 1503-1524, (2025).

Data were generated at the University of Florida. This dataset is not publicly accessible because: Data are not owned by EPA/ORD. It can be accessed through the following means: contact the study lead Dr. Timothy Townsend (ttown@ufl.edu). Format: Data were generated at the University of Florida. This dataset is associated with the following publication: Thompson, J., N. Robey, T. Tolaymat, J. Bowden, H.M. Solo-Gabriele, and T. Townsend. Underestimation of Per- and Polyfluoroalkyl Substances in Biosolids: Precursor Transformation During Conventional Treatment. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 57(9): 3825-3832, (2023).

This dataset contains the concentration and quality assurance results for 34 per- and polyfluoroalkyl substances (PFAS). 409 residential and commercial tapwater samples were collected once between May 2021 and May 2022, in the contiguous U.S., Alaska, Hawaii, Puerto Rico, and U.S. Virgin Islands. Of these samples 252 were from publicly supplied tapwater locations, and 155 were sourced from private wells, springs or catchment vessels. Additionally, three surface-water samples were collected in New Hampshire (as denoted with a site code suffix of '_SW' in Table 2a). An additional 85 samples were collected at 3 locations (privately sourced tapwater samples in New Jersey (30) and South Carolina (20), and a publicly supplied source in New Jersey (35)) between September 27, 2021 and December 20, 2021 to evaluate PFAS concentrations over time. Individual homeowner kits were shipped with supplies and protocols so the homeowner could collect and return the samples for analysis. Thirty-six quality-assurance field-blank samples were also collected. Quality-assurance matrix spike and surrogate percent recovery results are also presented. Samples were analyzed at the U.S. Geological Survey, National Water Quality Laboratory in Denver, Colorado. For privacy purposes, all sample locations are anonymized.

This dataset consists of summary data for potential landscape sources of per- and poly-fluoroalkyl substances (PFAS). These summary items include facilities from the Environmental Protection Agency (EPA) PFAS Analytics Tools, which were pulled from its Enforcement and Compliance History Online (ECHO), areas affected by fires (burned and urban burned areas) from Monitoring Trends in Burn Severity (MTBS), and landcover data from National Land Cover Dataset (NLCD) and Coastal Change Analysis Portal (C-CAP) around sites sampled as part of a National PFAS Tapwater Reconnaissance. These data are presented as a comma separated file, which includes summaries for all variables listed within a 5-kilometer buffer around each site, with an additional summary of burn areas within a 50-kilometer buffer. The purpose of this effort is to identify and quantify PFAS in drinking water sources at the point-of-use across the United States (US) and these data will be used to identify potential landscape-scale drivers of PFAS contamination in US tapwater (TW).