Groundwater-quality data were collected from 748 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program from May 2012 through December 2013. 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 indicators and constituents, including major ions, nutrients, trace elements, volatile organic compounds, pesticides, and radionuclides. These groundwater quality data are tabulated in this report. Quality-control samples also were collected; data from blank and replicate quality-control samples are included in this report.
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|edition||Version 1.0: Originally posted June 20, 2016; Version 1.1: November 18, 2016|
|tableOfContents||<ul><li>Abstract</li><li>Introduction</li><li>Purpose and Scope</li><li>Groundwater Study Design</li><li>Sample Collection and Analysis</li><li>Data Reporting</li><li>Quality-Assurance and Quality-Control Methods</li><li>Groundwater-Quality Data</li><li>Summary</li><li>Acknowledgments</li><li>References Cited</li></ul>|