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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 Datasets from Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January through December 2015 and Previously Unpublished Data from 2013-2014 Groundwater-quality data were collected from 502 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Project and are included in this data release. Most of the wells (500) were sampled from January through December 2015 and 2 of them were sampled in 2013. The data were collected from five types of well networks: principal aquifer study networks, which are used to assess the quality of groundwater used for public water supply; land-use study networks, which are used to assess land-use effects on shallow groundwater quality; major aquifer study networks, which are used to assess the quality of groundwater used for domestic supply; enhanced trends networks,... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), Water Quality, All tags... cycle 3, groundwater, nawqa, water quailty, 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 three-dimensional distribution of groundwater residence time metrics in the glaciated United States using metamodels trained on general numerical simulation models Residence time distribution (RTD) is a critically important characteristic of groundwater flow systems; however, it cannot be measured directly. RTD can be inferred from tracer data with analytical models (few parameters) or with numerical models (many parameters). The second approach permits more variation in system properties but is used less frequently than the first because large-scale numerical models can be resource intensive. With the data and computer codes in this data release users can (1) reconstruct and run 115 General Simulation Models (GSMs) of groundwater flow, (2) calculate groundwater age metrics at selected GSM cells, (3) train a boosted regression tree model using the provided data, (4) predict... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Boosted regression tree, Connecticut, Cycle 3, Glacial Principal Aquifer, Groundwater age, All tags... Groundwater model, Hydrology, Illinois, Indiana, Iowa, Kansas, Maine, Massachusetts, Metamodel, Michigan, Minnesota, Missouri, Montana, NAWQA, Nebraska, New Hampshire, New Jersey, New York, North Dakota, Ohio, Pennsylvania, Residence time distribution, Rhode Island, South Dakota, USGS Science Data Catalog (SDC), Vermont, Washington, Water Quality, Wisconsin, Fewer tags Data from Decadal Change in Groundwater Quality Web Site, 1988-2014, Version 2.0 Evaluating Decadal Changes in Groundwater Quality: Groundwater quality data were collected from 5,000 wells between 1988-2001 (first sampling event) by the U.S. Geological Survey’s 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 about 10 years later between 2002-2012 (second sampling event) to evaluate decadal changes in groundwater quality. Between 2012 and 2014 (third sampling event), a subset of these networks has been sampled again, allowing additional results to be displayed on the web page: Decadal changes in groundwater quality. Changes to this web page are referred... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: NAWQA, National Water Quality Program, USGS Science Data Catalog (SDC), United States, cycle 3, All tags... groundwater, groundwater quality, trends, water quality, 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 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 Release for Metamodeling and Mapping of Nitrate Flux in the Unsaturated Zone and Groundwater, Wisconsin, USA Widespread nitrate contamination of groundwater in agricultural areas poses a major challenge to sustainable water resources. Efficient analysis of nitrate fluxes across large regions also remains difficult. This study introduces a method of characterizing nitrate transport processes continuously across regional unsaturated zones and groundwater based on surrogate, machine-learning metamodels of an N flux process-based model. The metamodels used boosted regression trees (BRTs) to relate mappable variables to parameters and outputs of a “vertical flux method” (VFM) applied in the Fox-Wolf-Peshtigo (FWP) area in Wisconsin. In this context, the metamodels are upscaling the VFM results throughout the region, and the... Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Fox River, Wisconsin, Hydrogeology, NAWQA, National Water Quality Program, Peshtigo River, Wisconsin, All tags... USGS Science Data Catalog (SDC), Water Quality, Wisconsin, Wolf River, Wisconsin, cycle 3, groundwater, metamodel, nawqa, nitrate flux, unsaturated zone, water quality, Fewer tags Methane and benzene in drinking-water wells overlying the Eagle Ford, Fayetteville, and Haynesville Shale hydrocarbon production areas Groundwater samples were collected from domestic and public-supply wells in the Eagle Ford study area in 2015–16, in the Fayetteville study area in 2015, and in the Haynesville study area in 2014–15. One sample of produced water was collected from a gas well in the Haynesville  Shale in Rusk County, Texas in 2010, and 5 samples of produced water were collected from oil and condensate wells in the Eagle Ford Shale in Gonzales and Lavaca Counties, Texas in 2015. Groundwater samples were analyzed for major ions, nutrients, and trace elements; methane, methane H and C isotopic compositions, and C1-C5 gas composition; H and O isotopic composition of water; noble gas concentrations and isotopic compositions; tritium,... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Angelina County, Texas, Atascosa County, Texas, Benzene, Bienville County, Louisiana, Bossier County, Louisiana, All tags... Burleson County, Texas, Caddo County, Louisiana, Cleburne County, Arkansas, Conway County, Arkansas, De Soto County, Louisiana, Dimmit County, Texas, Faulkner County, Arkansas, Fayette County, Texas, Frio County, Texas, Goliad County, Texas, Gonzales County, Texas, Gregg County, Texas, Harrison County, Texas, Hydrogeology, Independence County, Arkansas, Jackson County, Arkansas, Karnes County, Texas, La Salle County, Texas, Lavaca County, Texas, McMullen County, Texas, Methane, NAWQA, Nacogdoches County, Texas, Natchitoches County, Louisiana, National Water Quality Program, Panola County, Texas, Red River County, Louisiana, Rusk County, Texas, Sabine County, Louisiana, Shelby County, Texas, USGS Science Data Catalog (SDC), Unconventional Oil and Gas, Upshur County, Texas, Van Buren County, Arkansas, Water Quality, Water Resources, White County, Arkansas, Wilson County, Texas, Zavala County, Texas, cycle 3, geochemistry, groundwater, water quality, Fewer tags Data for Groundwater-Quality and Select Quality-Control Data for the Colorado Plateaus Principal Aquifer Groundwater samples were collected from 60 public supply wells in the Colorado Plateaus principal aquifer. Water quality evaluations of groundwater for drinking water at public supply depths were made with the purpose of summarizing the current quality of source water (that is, untreated water) from public supply wells using two types of assessments; (1) status: an assessment that describes the current quality of the groundwater resource, and (2) understanding: an evaluation of the natural and human factors affecting the quality of groundwater, including an explanation of statistically significant associations between water quality and selected explanatory factors. To provide context for water-quality data, constituent... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Arizona, Colorado, Cycle 3, Hydrology, NAWQA, All tags... New Mexico, USGS Science Data Catalog (SDC), Utah, Water Quality, Water Resources, Wyoming, environment, groundwater, groundwater quality, inlandWaters, water quality, Fewer tags Laboratory Quality-Control Data Associated with Groundwater Samples Collected for Hormones and Pharmaceuticals by the National Water-Quality Assessment Project in 2013-15 This data set includes results for hormone and pharmaceutical compounds analyzed in laboratory quality-control samples associated with environmental samples collected by the National Water-Quality Assessment (NAWQA) 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 laboratory set blanks and reagent spikes analyzed during a time period that encompasses laboratory analysis of the environmental samples collected by NAWQA. Included in this data release are the following data tables: Table 1. Hormone results for laboratory set blanks, December 18, 2012 through March 7, 2016. Table 2. Pharmaceutical... 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 Groundwater nitrate data and ascii grids of predicted nitrate and model inputs for the Central Valley aquifer, California, USA The ascii grids associated with this data release are model inputs representing the Central Valley aquifer, California, and predicted nitrate concentrations (as NO3-N, mg/L) at two depth zones associated with private and public drinking water supply wells, respectively. The model input and prediction grids are bound by the alluvial bed boundary that defines the Central Valley. The prediction grids were produced with Boosted Regression Tree (BRT) modeling methods within a statistical modeling framework using the statistical modeling software R (R Core Team, https://www.r-project.org/) and linear interpolation within Oasis Montaj software (Geosoft, version 9.0.2). The response variable was a set of nitrate concentrations... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Boosted regression trees, California, Central Valley, Hydrogeology, Machine learning, All tags... NAWQA, National Water Quality Program, Nitrate, USGS Science Data Catalog (SDC), United States, Water Quality, Water Resources, cycle 3, groundwater, mathematical modeling, water quality, Fewer tags Data for Assessing the Lead Solubility Potential of Untreated Groundwater of the United States Groundwater chemistry data used for assessing the lead (Pb) solubility potential of untreated groundwater of the United States were compiled from the USGS National Water Information System (NWIS) database for groundwater sites sampled between January 1, 2000 and January 1, 2016. Two datasets were compiled: one dataset having 13,324 groundwater sites was used to assess Pb occurrence in untreated groundwater from different well types and a second dataset having 8,313 groundwater sites was used for geochemical modeling (Tables S1 and S2). In both datasets, only the most recent sample was used when multiple water-quality samples were available for a site. Samples were collected in accordance with protocols established... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geochemical modeling, Groundwater, Lead, NAWQA, Susceptibility, All tags... USGS Science Data Catalog (SDC), United States, Water quality, cycle 3, Fewer tags Datasets of Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January 2017 through December 2019 (ver. 1.1, January 2021) Groundwater-quality data were collected from 983 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and are included in this report. The data were collected from six types of well networks: principal aquifer study networks, which are used to assess the quality of groundwater used for public water supply; land-use study networks, which are used to assess land-use effects on shallow groundwater quality; major aquifer study networks, which are used to assess the quality of groundwater used for domestic supply; enhanced trends networks, which are used to evaluate the time scales during which groundwater quality changes; vertical flow-path study... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Domestic supply, Groundwater, Hydrology, NAWQA, All tags... Principal aquifer, Public water supply, USGS Science Data Catalog (SDC), United States, Water Quality, Water quality, Fewer tags Data for Machine Learning Predictions of Nitrate in Groundwater Used for Drinking Supply in the Conterminous United States A three-dimensional extreme gradient boosting (XGB) machine learning model was developed to predict the distribution of nitrate in groundwater across the conterminous United States (CONUS). Nitrate was predicted at a 1-square-kilometer (km) resolution for two drinking water zones, each of variable depth, one for domestic supply and one for public supply. The model used measured nitrate concentrations from 12,082 wells, and included predictor variables representing well characteristics, hydrologic conditions, soil type, geology, land use, climate, and nitrogen inputs. Predictor variables derived from empirical or numerical process-based models were also included to integrate information on controlling processes and... Categories: Data; 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... domestic well water use, groundwater, machine learning, nitrate, public supply water use, water quality, water well, Fewer tags Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 3.0, November 2023) Groundwater samples were collected and analyzed from 782 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and the water-quality data and quality-control data are included in this data release. The samples were collected from three types of well networks: principal aquifer study networks, which are used to assess the quality of groundwater used for public water supply; land-use study networks, which are used to assess land-use effects on shallow groundwater quality, and major aquifer study networks, which are used to assess the quality of groundwater used for domestic supply. Groundwater samples were analyzed for a large number of water-quality... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Cycle 3, Domestic supply, Groundwater, NAWQA, Principal aquifer, All tags... Public water supply, USGS Science Data Catalog (SDC), United States, Water quality, Fewer tags