This data release contains the concentration and quality-assurance results for inorganic constituents, as well as organic compounds (volatile organic compounds [VOC], per- and polyfluoroalkyl substances [PFAS], pesticides and disinfection byproducts [DBP]) and microbiological results collected in the Little Big Horn River and residential or commercial tapwater locations in Montana. Twenty-two tapwater samples (six sourced from public supply and 14 sourced from private wells) and six surface-water samples were collected in Montana between August 8-10, 2022. Pharmaceuticals, VOC, and PFAS were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Pesticides and DBP were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL) in Sacramento, California. Inorganic contaminants were analyzed at the USGS Redox Chemistry Laboratory (RCL) and the Analytical Trace Element Chemistry Laboratory (ATECL), Boulder, Colorado. Cyanotoxins were analyzed at the USGS Organic Geochemistry Research Laboratory (OGRL), Lawrence, Kansas. Microbiological pathogens were analyzed by the National Institute of Health/National Institute of Allergy and Infections Disease, Rocky Mountain Laboratory, Hamilton, Montana.

Concentration and quality assurance results for organic compounds analyzed at the National Water Quality Laboratory, Denver, Colorado, Organic Chemistry Research Laboratory, Sacramento, California, the Organic Geochemistry Research Laboratory, Lawrence, Kansas, for the 2019 tapwater study conducted in North Dakota and South Dakota, USA. This project is part of the U.S. Geological Survey, Ecosystems Mission Area, Environmental Health Infrastructure Project.

Concentration and quality assurance results for organic compounds analyzed at the National Water Quality Laboratory, Denver, Colorado, Organic Chemistry Research Laboratory, Sacramento, California, the Organic Geochemistry Research Laboratory, Lawrence, Kansas, for the 2019 tapwater study conducted in North Dakota and South Dakota, USA. This project is part of the U.S. Geological Survey, Ecosystems Mission Area, Environmental Health Infrastructure Project.

This dataset contains the concentration and quality assurance results for inorganic and organic analytes collected for the U.S. Geological Survey (USGS), Ecosystems Mission Area, Environmental Health Infrastructure Program, Tapwater Exposure Project conducted in Minnesota, in August of 2019. Samples were obtained from multiple publicly distributed water sources in Minnesota in 2019. Due to privacy concerns, the exact location where samples were collected are not reported and station identification numbers have been anonymized. Water-quality samples were analyzed for pesticides, pharmaceuticals, volatile organic compounds and per- and polyfluoroalkyl substances at the USGS National Water Quality Laboratory (NWQL), Denver, Colorado; disinfection byproducts were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL), Sacramento, California; inorganic analytes (cations, anions, nitrate, and trace elements) were analyzed at the USGS Redox Chemistry Laboratory (RCL), Boulder, Colorado; cyanotoxins were analyzed at the USGS Organic Geochemistry Research Laboratory (OGRL), Lawrence, Kansas. Water samples for bioassay analyses (estrogen, androgen, and glucocorticoid receptor) were extracted at the OGRL and analyzed at the U.S. Environmental Protection Agency, Durham, North Carolina.

This dataset contains the concentration and quality assurance results for inorganic and organic analytes collected for the U.S. Geological Survey (USGS), Ecosystems Mission Area, Environmental Health Infrastructure Program, Tapwater Exposure Project conducted in Minnesota, in August of 2019. Samples were obtained from multiple publicly distributed water sources in Minnesota in 2019. Due to privacy concerns, the exact location where samples were collected are not reported and station identification numbers have been anonymized. Water-quality samples were analyzed for pesticides, pharmaceuticals, volatile organic compounds and per- and polyfluoroalkyl substances at the USGS National Water Quality Laboratory (NWQL), Denver, Colorado; disinfection byproducts were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL), Sacramento, California; inorganic analytes (cations, anions, nitrate, and trace elements) were analyzed at the USGS Redox Chemistry Laboratory (RCL), Boulder, Colorado; cyanotoxins were analyzed at the USGS Organic Geochemistry Research Laboratory (OGRL), Lawrence, Kansas. Water samples for bioassay analyses (estrogen, androgen, and glucocorticoid receptor) were extracted at the OGRL and analyzed at the U.S. Environmental Protection Agency, Durham, North Carolina.

Tapwater samples were obtained from groundwater sources on French Island, in the town of Campbell, Wisconsin. Samples from three locations were collected multiple times over a period of three days to assess temporal variations in water quality. Samples from an additional eight locations, were collected one time, spatially distributed around Campbell. Due to privacy concerns, the exact location of samples are anonymized. Concentration results for organic and inorganic contaminants and microbiology as well as quality-assurance results, are provided. Pesticides, pharmaceutical, volatile organic compounds, semivolatile organic compounds and per- and polyfluoroalkyl substances (PFAS) were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Disinfection byproducts were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL) in Sacramento, California. Inorganic contaminants were analyzed at the USGS Redox Chemistry Laboratory (RCL) and the Analytical Trace Element Chemistry Laboratory (ATECL), Boulder, Colorado in Boulder, Colorado. Cyanotoxins were analyzed at the Organic Geochemistry Research Laboratory, Lawrence, Kansas. This data release contains the inorganic results along with the volatile organic compounds, semi-volatile organic compounds, disinfection by products, pesticide, pharmaceutical, per- and polyfluoroalkyl substance (PFAS), total coliforms, Escherichia coli and heterotrophic plate count results. Expected future updates will release the cyanotoxin results when available.

Tapwater samples were obtained from groundwater sources on French Island, in the town of Campbell, Wisconsin. Samples from three locations were collected multiple times over a period of three days to assess temporal variations in water quality. Samples from an additional eight locations, were collected one time, spatially distributed around Campbell. Due to privacy concerns, the exact location of samples are anonymized. Concentration results for organic and inorganic contaminants and microbiology as well as quality-assurance results, are provided. Pesticides, pharmaceutical, volatile organic compounds, semivolatile organic compounds and per- and polyfluoroalkyl substances (PFAS) were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Disinfection byproducts were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL) in Sacramento, California. Inorganic contaminants were analyzed at the USGS Redox Chemistry Laboratory (RCL) and the Analytical Trace Element Chemistry Laboratory (ATECL), Boulder, Colorado in Boulder, Colorado. Cyanotoxins were analyzed at the Organic Geochemistry Research Laboratory, Lawrence, Kansas. This data release contains the inorganic results along with the volatile organic compounds, semi-volatile organic compounds, disinfection by products, pesticide, pharmaceutical, per- and polyfluoroalkyl substance (PFAS), total coliforms, Escherichia coli and heterotrophic plate count results. Expected future updates will release the cyanotoxin results when available.

In the United States and globally, the lack of data on contaminant exposure from unregulated private-well point-of-use (POU) tapwater (TW) is a recognized public health data gap and an obstacle to risk management and homeowner decision making. Mead, Nebraska, is an agricultural community about 30 miles west of Omaha. To help address the lack of data on broad contaminant exposures in TW sourced from private water wells, a total of 22 samples were collected from 18 private wells during June 2022 and January 2023 and analyzed for 495 organic compounds, 34 inorganic constituents, and 11 microbial groups. The organic compounds included pesticides, pharmaceuticals, volatile organic compounds (VOCs), disinfection byproducts (DBPs), per- and polyfluoroalkyl substances (PFAS), and cyanotoxins. An additional three samples from existing private POU water filters were collected and analyzed only for pesticides. Pesticides and disinfection byproducts (DBP) were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL) in Sacramento, California. Pharmaceuticals, VOCs, and PFAS were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Cyanotoxins were analyzed at the USGS Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas. Inorganic constituents were analyzed at the USGS Redox Chemistry Laboratory (RCL) in Boulder, Colorado. Microbiological samples were analyzed by the USGS Michigan Bacterial Research Laboratory (MIBaRL) in Lansing, Michigan.

In the United States and globally, the lack of data on contaminant exposure from unregulated private-well point-of-use (POU) tapwater (TW) is a recognized public health data gap and an obstacle to risk management and homeowner decision making. Mead, Nebraska, is an agricultural community about 30 miles west of Omaha. To help address the lack of data on broad contaminant exposures in TW sourced from private water wells, a total of 22 samples were collected from 18 private wells during June 2022 and January 2023 and analyzed for 495 organic compounds, 34 inorganic constituents, and 11 microbial groups. The organic compounds included pesticides, pharmaceuticals, volatile organic compounds (VOCs), disinfection byproducts (DBPs), per- and polyfluoroalkyl substances (PFAS), and cyanotoxins. An additional three samples from existing private POU water filters were collected and analyzed only for pesticides. Pesticides and disinfection byproducts (DBP) were analyzed at the USGS Organic Chemistry Research Laboratory (OCRL) in Sacramento, California. Pharmaceuticals, VOCs, and PFAS were analyzed at the U.S. Geological Survey (USGS) National Water Quality Laboratory (NWQL) in Denver, Colorado. Cyanotoxins were analyzed at the USGS Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas. Inorganic constituents were analyzed at the USGS Redox Chemistry Laboratory (RCL) in Boulder, Colorado. Microbiological samples were analyzed by the USGS Michigan Bacterial Research Laboratory (MIBaRL) in Lansing, Michigan.

Surface-water organic contaminant concentration data for targeted chemical analysis of over 800 organic analytes in surface water from 38 stream site representing national gradients in urban and agricultural land use in the USA during 2012-14. ScienceBase Data Release for journal article entitled, "Expanded Target-Chemical Analysis Reveals Extensive Mixed-Organic-Contaminant Exposure in USA Streams"