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Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 3. Detailed information on calculations of environmental tracer data. High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined... Categories: Data; Types: Citation; Tags: Cambrian-Ordovician aquifer system, Illinois, Iowa, Michigan, Minnesota, All tags... NAWQA, Wisconsin, alpha recoil, cycle 3, dissolved gas, groundwater age, lumped parameter modeling, nawqa, radium, radium 226 distribution coefficient, recharge temperature, water quality, Fewer tags Environmental and Quality-Control Data Collected by the USGS National Water-Quality Assessment Project for Hormones and Pharmaceuticals in Groundwater Used as a Source of Drinking Water Across the United States, 2013-15 This data set includes results for hormone and pharmaceutical compounds analyzed in environmental and quality-control samples collected by the USGS National Water-Quality Assessment Project during 2013 through 2015 for a study of groundwater resources used for drinking-water supply across the United States. Hormone and pharmaceutical results are provided for environmental samples collected at 1,120 wells or springs; selected ancillary data, such as principal aquifer, well depth, and land-use information also are provided for the sampled sites. The types of quality-control samples included in this data set are blanks, matrix spikes, and replicates collected at field sites or field offices. Included in this data... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Drinking water, Environmental Health, Groundwater, Hormones, All tags... Human health, NAWQA, National Water Quality Program, Pharmaceuticals, USGS Science Data Catalog (SDC), United States, Water Quality, Water quality, Fewer tags Data for the occurrence and distribution of strontium in U.S. groundwater Water-quality data for groundwater samples collected from 4,824 sites between 1991 through 2018, and ancillary data and information on sampled wells and principal aquifers, were used to assess the occurrence and distribution of strontium in U.S. groundwater from 32 principal aquifers. This data release includes one tab-delimited text file detailing these data. Table: Chemical data from the U.S. Geological Survey National Water Information System and ancillary data considered for assessment of strontium concentration in U.S. groundwater. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrology, NAWQA, USGS Science Data Catalog (SDC), Water Quality, cycle 3, All tags... drinking water, groundwater, strontium, water quality, Fewer tags Geochemical and Geospatial Data for Per- and Polyfluoroalkyl Substances (PFAS) in Groundwater Used as a Source of Drinking Water in the Eastern United States 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... Categories: Data; Tags: Alabama, Florida, Georgia, Hydrology, Illinois, All tags... Indiana, Kentucky, Maine, Massachusetts, Mississippi, NAWQA, New Hampshire, Ohio, PFAS, Pennsylvania, Rhode Island, South Carolina, Tennessee, USGS Science Data Catalog (SDC), Water Quality, West Virginia, cycle 3, groundwater, Fewer tags Data for Groundwater Age and Susceptibility of Poorly Consolidated Sedimentary Aquifers of the United States Gulf Coast: Results from the Southeast Coastal Plain (SECP), Coastal Lowland (CLOW), Mississippi Embayment and Texas Coastal Upland (METX) Principal Aquifer Networks This data release documents eight Microsoft Excel tables; four which contain data for understanding groundwater ages in the South East Coastal Plain (SECP), Coastal Lowlands (CLOW) and Mississippi Embayment and Texas Coastal Uplands (METX) aquifer systems and four that describe the data fields. Results described include dissolved gas modeling results, environmental tracer concentrations (tritium, tritiogenic helium-3, sulfur hexafluoride, and radiogenic helium-4), mean age and age distribution, and carbon-14 geochmical modeling results Dissolved gas modeling results (DGmodel) contains detailed information on the calibration of dissolved gas models to dissolved gas concentrations (neon, argon, krypton, xenon, and... Categories: Data; Tags: Alabama, Arkansas, Coastal Lowlands (CLOW), Cycle 3, Dissolved gas, All tags... Florida, Georgia, Groundwater, Groundwater age, Gulf Coast, Gulf and South Atlantic Coast Aquifers, Kentucky, Louisiana, Lumped parameter modeling, Mississippi, Mississippi Embayment and Texas Coastal Uplands (METX), Missouri, NAWQA, Recharge temperature, South Atlantic coast, South Carolina, South East Coastal Plain (SECP), Tennessee, Texas, USGS Science Data Catalog (SDC), Water Quality, Water quality, Fewer tags Third-party performance assessment data encompassing the time period of analysis of groundwater samples collected for hormones and pharmaceuticals by the National Water-Quality Assessment Project in 2013-15 This data set includes sample information and results for third-party performance assessment samples analyzed for hormones and pharmaceuticals during the same general time period as environmental samples collected by the National Water-Quality Assessment (NAWQA) Project for a study of groundwater resources used for drinking-water supply across the United States, 2013 through 2015. Hormone and pharmaceutical results are provided for spiked and unspiked samples submitted by the Quality Systems Branch (QSB) Organic Blind Sample Project (OBSP), providing information regarding analyte recovery and occurrence of false positive and false negative results. Included in this data release are the following data tables: Table... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Groundwater, NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), All tags... United States, Water Quality, Water quality, hormones, laboratory performance, pharmaceuticals, quality control, Fewer tags Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 1. Dissolved gas modeling results, environmental tracer concentrations (tritium, tritiogenic helium-3, sulfur hexafluoride, carbon-14, and radiogenic helium-4), and results for the mean age of groundwater by calibration of lumped parameter models to tracer concentrations. High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined... Categories: Data; Types: Citation; Tags: Cambrian-Ordovician aquifer system, Illinois, Iowa, Michigan, Minnesota, All tags... NAWQA, Wisconsin, alpha recoil, cycle 3, dissolved gas, groundwater age, lumped parameter modeling, nawqa, radium, radium 226 distribution coefficient, recharge temperature, water quality, Fewer tags Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA: Table 2. Detailed information on the calibration of dissolved gas models to dissolved gas concentrations (neon, argon, krypton, xenon, and nitrogen). High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined... Categories: Data; Types: Citation; Tags: Cambrian-Ordovician aquifer system, Illinois, Iowa, Michigan, Minnesota, All tags... NAWQA, Wisconsin, alpha recoil, cycle 3, dissolved gas, groundwater age, lumped parameter modeling, nawqa, radium, radium 226 distribution coefficient, recharge temperature, water quality, Fewer tags Inorganic Constituent and Ancillary Data for Evaluation of Lithium in Groundwater in the United States, 1991-2018 Lithium concentrations in untreated groundwater from 1,464 public-supply wells, 1,676 domestic-supply wells, and 1,560 monitoring wells distributed across 33 principal aquifers in the United States were evaluated for spatial variations and possible explanatory factors. For context, lithium concentrations are compared to a drinking-water only threshold (60 micrograms per liter) and a Health-Based Screening Level (HBSL, 10 micrograms per liter). These thresholds were exceeded in 9% and 45% of samples from public-supply wells and in 6% and 37% from domestic-supply wells, respectively. Exceedances were most frequent for arid regions and older groundwater. Groundwater lithium concentrations were highest in unconsolidated... Categories: Data; Tags: Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, Water Quality, All tags... Water Resources, cycle 3, drinking water use, lithium, public supply water use, water quality, Fewer tags Data for Tritium as an Indicator of Modern, Mixed and Premodern Groundwater Age Categorical classification of groundwater age based on concentrations of tritium (3H) in groundwater can provide useful information for the assessment and understanding of groundwater resources. These data present a three-part groundwater age classification system for the continental United States based on tritium thresholds that vary in space and time: modern (recharged after 1952), if the measured value is larger than an upper threshold; premodern (recharged prior to 1953) if the measured value is smaller than a lower threshold; or mixed if the measured value is between the two thresholds. Inclusion of spatially-varying that vary geographically on the basis of the location of the sample rather than a single threshold... Categories: Data; Tags: Conterminous United States, Cycle 3, Groundwater age, Hydrogeology, NAWQA, All tags... Recharge, Tritium, USGS Science Data Catalog (SDC), Water Quality, Water quality, Fewer tags Data for assessing the susceptibility of groundwater used for drinking water supply from selected principal aquifers of the Western United States, 2004-2018 Groundwater age distribution and susceptibility to natural and anthropogenic contaminants were assessed for selected principal aquifers of the Western United States: the Central Valley aquifer system (CVAL), the Basin and Range basin-fill aquifers (BNRF), the Rio Grande aquifer system (RIOG), the High Plains aquifer (HPAQ), the Columbia Plateau basaltic-rock aquifers (CLPT), and the Colorado Plateaus aquifers (COPL). Groundwater ages were estimated by calibration of environmental tracers (tritium, tritiogenic helium-3, chlorofluorocarbons, sulfur hexafluoride, carbon-14 and radiogenic helium-4) to lumped parameter models (LPMs) for 1,353 samples from 1,182 sample locations. Groundwater samples were collected from... Categories: Data; Tags: Arizona, Basin and Range Aquifers, California, Central Valley Aquifer, Colorado, All tags... GAMA, High Plain Aquifer, Idaho, Kansas, NAWQA, Nebraska, Nevada, New Mexico, Oklahoma, Oregon, Rio Grande Aquifer, Texas, USGS Science Data Catalog (SDC), Utah, Washington, Water Resources, Wyoming, cycle 3, dissolved gases, groundwater, groundwater age, groundwater quality, lumped parameter model, recharge temperature, western principal aquifers, Fewer tags Datasets from Groundwater-Quality Data from the National Water-Quality Assessment Project, January through December 2014 and Select Quality-Control Data from May 2012 through December 2014 Groundwater-quality data were collected from 559 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program from January through December 2014. The data were collected from four types of well networks: principal aquifer study networks, which assess the quality of groundwater used for public water supply; land-use study networks, which assess land-use effects on shallow groundwater quality; major aquifer study networks, which assess the quality of groundwater used for domestic supply; and enhanced trends networks, which evaluate the time scales during which groundwater quality changes. Groundwater samples were analyzed for a large number of water-quality... Categories: Data; Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrogeology, NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, cycle 3, groundwater, groundwater, nawqa, water quality, Fewer tags Data from Decadal Change in Groundwater Quality Web Site, 1988-2020 Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later between 2002-2012 (second sampling event) to evaluate decadal changes in groundwater quality. Between 2012 and 2020 (third sampling event), a subset of these networks was sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality (https://nawqatrends.wim.usgs.gov/decadal/).... Categories: Data; Tags: Cycle 3, Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, groundwater, groundwater quality, water quality, Fewer tags Data Release for Evaluation of Six Methods for Correcting Bias in Estimates from Ensemble Tree Machine Learning Regression Models Ensemble-tree machine learning (ML) regression models can be prone to systematic bias: small values are overestimated and large values are underestimated. Additional bias can be introduced if the dependent variable is a transform of the original data. Six methods were evaluated for their ability to correct systematic and introduced bias: (1) empirical distribution matching (EDM); (2) regression of observed on estimated values (ROE); (3) linear transfer function (LTF); (4) linear equation based on Z-score transform (ZZ); (5) second machine learning model used to estimate residuals (ML2-RES); and (6) Duan smearing estimate applied after ROE is implemented (ROE-Duan). The performance of the methods was evaluated using... Categories: Data; Tags: Central Valley, California, Glacial aquifer system, Mississippi Embayment, NAWQA, North Atlantic Coastal Plain, All tags... USGS Science Data Catalog (SDC), Water Quality, cycle 3, groundwater, hydrology, machine learning, regression model, Fewer tags Data for depth of groundwater used for drinking-water supplies in the United States This data release includes grids representing the depth and thickness of drinking-water withdrawal zones, polygons of hydrogeologic settings, an inventory of sources of well construction data, and summaries of data comparisons used to assess the depth of groundwater used for drinking-water supplies in the United States. Well construction data sources are documented in Table1_DataSources.xlsx. Data comparisons using the Mann-Whitney test to assess similarity between hydrogeologic settings were used to justify combining data where they were sparse (compare_neighbors_all_domestic.txt and compare_neighbors_all_public.txt). Water-supply-well depth varies geographically by water use and the type of well, which illustrates... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, Water Resources, aquifers, domestic well water use, drinking water use, groundwater, public supply water use, water quality, Fewer tags Data from Decadal Change in Groundwater Quality Web Site, 1988-2021 Evaluating Decadal Changes in Groundwater Quality: Groundwater-quality data were collected from 5,000 wells between 1988-2001 (first decadal sampling event) by the National Water-Quality Assessment Project. Samples are collected in groups of 20-30 wells with similar characteristics called networks. About 1,500 of these wells in 67 networks were sampled again approximately 10 years later between 2002-2012 (second sampling event) to evaluate decadal changes in groundwater quality. Between 2012 and 2021 (third sampling event), a subset of these networks were sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality (https://nawqatrends.wim.usgs.gov/decadal/).... Categories: Data; Tags: Cycle 3, Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, groundwater, groundwater quality, water quality, Fewer tags Inventory of well-construction data, water-quality and quality control data, statistical data, and geochemical modeling data for wells in Atlantic and Gulf Coastal Plain aquifers, eastern United States, 2012 and 2013 This dataset provides analytical and other data in support of an analysis of lead and manganese in untreated drinking water from Atlantic and Gulf Coastal Plain aquifers, eastern United States. The occurrence of dissolved lead and manganese in sampled groundwater, prior to its distribution or treatment, is related to the potential presence of source minerals and specific environmental factors including hydrologic position along the flow path, water-rock interactions, and associated geochemical conditions such as pH and dissolved oxygen (DO) concentrations. A DO/pH framework is proposed as a screening tool for evaluating risk of elevated lead or manganese, based on the occurrence of elevated lead and manganese concentrations... Categories: Data; Tags: Adsorption, Alabama, Coastal Plain aquifer, Cycle 3, Delaware, All tags... Dissolved oxygen, Drinking water, Florida, Geochemical modeling, Georgia, Groundwater quality, Kentucky, Lead, Louisiana, Manganese, Maryland, Minerals, Mississippi, NAWQA, New Jersey, New York, North Atlantic Coastal Plain, North Carolina, Pennsylvania, Redox, South Carolina, Southeastern Coastal Plain, Tennessee, Texas, USGS Science Data Catalog (SDC), Virginia, Water quality, pH, Fewer tags Data for Radium Mobility and the Age of Groundwater in Public-drinking-water Supplies from the Cambrian-Ordovician Aquifer System, North-Central USA High radium (Ra) concentrations in potable portions of the Cambrian-Ordovician (C-O) aquifer system were investigated using water-quality data and environmental tracers ( 3H, 3Hetrit, SF6 , 14C and 4Herad) of groundwater age from 80 public-supply wells (PSWs). Groundwater ages were estimated by calibration of tracers to lumped parameter models and ranged from modern (1 Myr) in the most downgradient, confined portions of the potable system. More than 80 and 40 percent of mean groundwater ages were older than 1000 and 50,000 yr, respectively. Anoxic, Fe-reducing conditions and increased mineralization develop with time in the aquifer system and mobilize Ra into solution resulting in the frequent occurrence of combined... Categories: Data; Types: Citation; Tags: Cambrian-Ordovician aquifer system, Illinois, Iowa, Michigan, Minnesota, All tags... NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), Wisconsin, alpha recoil, cycle 3, dissolved gas, groundwater age, lumped parameter modeling, nawqa, radium, radium 226 distribution coefficient, recharge temperature, water quality, Fewer tags Point data for four case studies related to testing of multi-order hydrologic position The location of a point (or pixel) within the conterminous U.S. can be assigned based on its position relative to the Nation’s stream network. Two metrics are recognized: lateral position (LP) and distance from stream to divide (DSD). And given that a point can have different positions in different hydrologic orders the term multi-order hydrologic position (MOHP) is used to describe the ensemble of hydrologic positions. LP and DSD were developed for nine hydrologic orders across the conterminous U.S. (Belitz and others, 2019; Moore and others, 2019). Four case studies are presented here that were used for evaluating the utility of MOHP in the context of random forest machine learning (Belitz and others, 2019).... Categories: Data; Tags: Central Valley, California, Conterminous United States, Cycle 3, Fox-Wolf-Peshtigo, Groundwater, All tags... Hydrologic position, Hydrologic systems, Hydrology, Information Sciences, Machine learning, NAWQA, USGS Science Data Catalog (SDC), Water quality, Wisconsin, Fewer tags Data for Elevated Manganese Concentrations in United States Groundwater, Role of Land Surface-Soil-Aquifer Connections Chemical data from 43,334 wells were used to examine the role of land surface-soil-aquifer connections in producing elevated manganese concentrations (>300 µg/L) in United States (U.S.) groundwater. Elevated manganese and dissolved organic carbon (DOC) concentrations were associated with shallow water tables and organic-carbon rich soils, suggesting soil-derived DOC supported manganese reduction. Manganese and DOC concentrations were higher near rivers than farther from rivers, suggesting river-derived DOC also supported manganese reduction. Anthropogenic nitrogen may also affect manganese concentrations in groundwater. In parts of the northeastern U.S. containing poorly buffered soils, ~40% of the samples with... Categories: Data; Tags: Environmental Health, Hydrogeology, NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), All tags... United States, Water Quality, cycle 3, drinking water, groundwater, groundwater quality, land surface-soil-aquifer connections, manganese concentrations, water quality, Fewer tags 1 2 »