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Data provided here describe geochemical correction of carbon-14 in dissolved inorganic carbon (DIC) for groundwater age dating. Datasets include major ion chemistry of groundwater samples, model...
Search relevance: 1.00 | Views last month: 22 | Catalog Last Checked: May 05, 2026 at 08:19 PM -
This data release includes tables and time-series plots of results for volatile organic compounds (VOCs) analyzed in samples of groundwater used for public supply that were collected by the USGS...
Search relevance: 1.00 | Views last month: 10 | Catalog Last Checked: May 05, 2026 at 09:58 PM -
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...
Search relevance: 1.00 | Views last month: 10 | Catalog Last Checked: May 05, 2026 at 08:52 PM -
Concentrations of inorganic constituents, dissolved organic carbon (DOC), tritium, per- and polyfluoroalkyl substances (PFAS), volatile organic compounds (VOCs), and pharmaceuticals were measured...
Search relevance: 1.00 | Views last month: 9 | Catalog Last Checked: May 05, 2026 at 08:32 PM -
Water-quality data for groundwater samples collected from 4,824 sites, and ancillary data and information on sampled wells and principal aquifers, were used to assess the occurrence and...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: May 05, 2026 at 07:38 PM -
Water samples from 50 domestic wells located <1 kilometer (km) (proximal) and >1 km (distal) from shale-gas wells in upland areas of the Marcellus Shale region were analyzed for chemical, isotopic...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: May 05, 2026 at 08:06 PM -
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...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: May 05, 2026 at 08:18 PM -
Continuous monitoring and discrete water-quality sampling were coupled in a karst aquifer to assess drivers and timescales of water-quality change. Water-quality data included environmental...
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This data set includes results for hormone and pharmaceutical compounds analyzed from 2012 through 2016 in laboratory quality-control samples that are associated with environmental samples...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: May 05, 2026 at 08:51 PM -
This data release documents four tables that contain data for assessing the susceptibility of groundwater using environmental tracers collected from public-supply wells located in the Northern...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: May 05, 2026 at 08:38 PM -
This data release documents nine Microsoft Excel tables that contain data for understanding groundwater ages in the Glacial aquifer system. Results for the four sample networks (PAS, principal...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: May 05, 2026 at 09:23 PM -
Three wells in New Hampshire were sampled bimonthly over three years to evaluate the temporal variability of arsenic concentrations and groundwater age. All samples had measurable concentrations...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: May 05, 2026 at 08:15 PM -
Data from 38,105 wells were used to characterize fluoride occurrence in untreated United States groundwater. The data were retrieved from the U.S. Geological Survey (USGS) National Water...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: May 05, 2026 at 08:01 PM -
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...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: May 05, 2026 at 10:19 PM -
Groundwater-quality data were collected from 648 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and are included in...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 08:35 PM -
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...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 09:17 PM -
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...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 10:08 PM -
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...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 08:43 PM -
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...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 09:08 PM -
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.)...
Search relevance: 1.00 | Views last month: 4 | Catalog Last Checked: May 05, 2026 at 10:16 PM
