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Filters Date Range Past year (1) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts Laura M Bexfield U.S. Geological Survey Delicia Beaty U.S. Geological Survey - ScienceBase Water Resources More... Tag Schemes None (15) USGS Thesaurus (8) ISO 19115 Topic Category (2) Tags (with Type=Theme ) groundwater (2) nawqa (2) quality control (2) water quality (2) cycle 3 (1) disinfection by-products (1) environment (1) More... View Results as: JSON ATOM CSV

Data for volatile organic compounds in groundwater used for public supply across the United States, 2013-19, and data for associated quality-control samples 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 National Water-Quality Assessment (NAWQA) Project and the California State Water Resources Control Board’s Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP) during 2013-19; results for associated quality-control samples also are included. All samples were analyzed by the USGS National Water Quality Laboratory (NWQL) using laboratory schedules 4436 and 4437. The table of groundwater data includes VOC results as reported by the laboratory, along with results that represent the application... Tags: GAMA, Hydrology, NAWQA, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, cycle 3, disinfection by-products, environment, fumigants, gasoline hydrocarbons, gasoline oxygenates, groundwater, health, quality assessment, quality control, solvents, trihalomethanes, volatile organic compounds, water quality, Fewer tags Field, laboratory, and third-party quality-control data associated with sites and analytes monitored by the USGS National Water Quality Network, October 2017 through September 2022 From October 2017 through September 2022, the National Water Quality Network (NWQN) monitored 110 surface-water river and stream sites and more than 1,800 groundwater wells for a large number of water-quality analytes, for which associated quality-control data and corresponding statistical summaries are included in this data release. The quality-control data—for samples that were collected in the field (at all 110 surface-water sites, 350 groundwater wells, and 16 quality-control-only sites), prepared in the laboratory, or prepared by a third party—can be used to assess the quality of environmental data collected by the NWQN through the estimation of bias and variability in reported results. The general analyte... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrology, NAWQA, NWQN, USGS Science Data Catalog (SDC), United States, All tags... Water Quality, groundwater, groundwater quality, quality control, river systems, surface water (non-marine), surface water quality, water quality, Fewer tags