Summary statistics of indoor and outdoor collected ionic PFAS where values have been mean field blank subtracted. n.d. indicates non-detect and values with a “<” in front indicate that that PFAS was detected but at concentrations below the MDL. Concentrations below the MDL were not adjusted. This dataset is associated with the following publication: Chang, N., C. Eichler, D. Amparo, J. Zhou, K. Baumann, E. Cohen-Hubal, J. Surratt, G. Morrison, and B. Turpin. Indoor air concentrations of PM2.5 quartz fiber filter-collected ionic PFAS and emissions to outdoor air: findings from the IPA campaign. Environmental Science: Processes & Impacts. Royal Society of Chemistry, Cambridge, UK, 27(6): 1603-1618, (2025).

In this dataset, we present data on PFAS measured using nontargeted methods in American Healthy Homes Study (AHHS) II residential tap water. Residential drinking water samples were collected as part of the American Healthy Homes Survey (AHHS) II effort by HUD for surveillance of chemicals of concern. Previous analysis was conducted on the collected media to account for lead, but the stability of PFAS enables follow-up analysis even after lead processing. PFAS were analyzed in ~800 water samples using non-targeted analysis by mass spectrometry. Because the methods are nontargeted and thus performed without prior knowledge of the identity of the PFAS in the sample, values are reported as instrument response integrated areas. This dataset is not publicly accessible because: EPA cannot release personally identifiable information regarding living individuals, according to the Privacy Act and the Freedom of Information Act (FOIA). This dataset contains information about human research subjects. Because there is potential to identify individual participants and disclose personal information, either alone or in combination with other datasets, individual level data are not appropriate to post for public access. Restricted access may be granted to authorized persons by contacting the party listed. It can be accessed through the following means: Data presented in this manuscript is available upon reasonable request by contacting the authors, but locations may be censored to protect confidentiality of study participants. Format: EPA’s Office of Research and Development (ORD) was not directly engaged in the collection of information from human subjects. HUD’s contractor, QuanTech, conducted the field study and collected tap water and house dust samples. QuanTech received IRB Approval CR00077983 for HUD OHHLHC - AHHS II, American Healthy Homes Survey (AHHS) II (Pro00019737). According to the requirements of EPA Order 1000.17 A (Policy and Procedures on Protection of Human Research Subjects) and EPA Regulation 40 CFR 26 (Protection of Human Subjects), it was determined that the EPA investigators were not engaged in human subjects research (HSR-001225). This dataset is associated with the following publication: Boettger, J., N. Deluca, M. Zurek-Ost, K. Miller, C. Fuller, K. Bradham, P. Ashley, W. Friedman, E. Pinzer, D. Cox, G. Dewalt, K. Isaacs, E. Cohen-Hubal, and J. McCord. Emerging Per- and Polyfluoroalkyl Substances in Tap Water from the American Healthy Homes Survey II. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 59(5): 2686–2698, (2025).

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.

This data release provides concentration results for per- and polyfluoroalkyl substances (PFAS) collected by volunteer community members, in tapwater samples from 83 private residences, in select areas within the United States. Samples were collected July 1, 2023, through November 10, 2023. 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.

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.

These data were part of a critical review that looks at the occurrence of PFOS in ambient surface waters across the U.S. All data from this paper were obtained from publicly available literature, including peer-review journal articles, theses, and government and industry reports through 2020. These data include measured PFOS concentrations across the U.S., sample site location (i.e., state, waterbody, and GPS coordinates), and dates of sample collection and analysis, and analytical methods used. Citation information for this dataset can be found in the EDG's Metadata Reference Information section and Data.gov's References section.

the data include results of PFAS concentration in primary and secondary landfill leachate. Each figure in the manuscript has a specific sheet associated with it. This dataset is associated with the following publication: Robey, N., Y. Liu, T. Tolaymat, J. Bowden, H. Solo-Gabriele, and T. Townsend. Per- and Polyfluoroalkyl Substances (PFAS) Profiles in Primary and Secondary Landfill Leachates: Indications of Transformation, Liner Interactions, and other PFAS Sources. JOURNAL OF HAZARDOUS MATERIALS. Elsevier Science Ltd, New York, NY, USA, 494: 138705, (2025).

data presented to show correlation between PFAS in leachate and physical chemical parameters. This dataset is associated with the following publication: Zhang, H., Y. Chen, Y. Liu, J. Bowden, T. Tolaymat, T. Townsend, and H. Solo-Gabriele. Relationships between Per- and Polyfluoroalkyl Substances (PFAS) and Physical-Chemical Parameters in Aqueous Landfill Samples. CHEMOSPHERE. Elsevier Science Ltd, New York, NY, USA, 329: 138541, (2023).

Per- and polyfluoroalkyl substances (PFAS) and related chemical and physical data are presented from shallow soil and groundwater at two sites in New Hampshire. The two sites, the former Brentwood Fire Training Area and White Farm, were selected because materials known to contain PFAS were used at each site. White Farm is an active farm where biosolids have been applied for several years. At the former Brentwood Fire Training Area, PFAS-containing aqueous film-forming foams were applied as part of regular fire training exercises. At each site, soil samples were collected in a gridded pattern over the site. Soil horizons within the sampling intervals were described using the National Soil Survey Center Natural Resources Conservation Service U.S. Department of Agriculture Field Book for Describing and Sampling Soils (Schoeneberger and others, 2012). Analyses included 36 PFAS compounds, 36 PFAS compounds post-total oxidizable precursor assay (TOPA), total organic carbon (TOC), moisture content, pH, autoclaved-citrate extractable protein, grain size, major ions and other physical and physicochemical parameters. Groundwater samples were collected and analyzed for PFAS during two sampling events at each site from temporary wells, existing monitoring wells, and/or pushpoint samplers. Additionally, a lysimeter was installed at the center of each site and a composite sample through the duration of each water sampling event (approximately 7 days) was collected. Quality control samples included source-solution blanks, equipment blanks, and replicates. Reference: Schoeneberger, P.J., Wysocki, D.A., Benham, E.C., and Soil Survey Staff, 2012, Field book for describing and sampling soils, Version 3.0: Natural Resources Conservation Service, National Soil Survey Center, Lincoln, NE.