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#1 Federal

Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025)

Organization: Department of the Interior
Dataset Last Updated: April 29, 2025 at 12:00 AM

Groundwater samples were collected and analyzed from 1,015 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National Water-Quality Program and the...

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Search relevance: 1.00 | Views last month: 12 | Catalog Last Checked: September 10, 2026 at 08:58 PM

#2 Federal

Datasets from Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January through December 2016, and Previously Unpublished Data from 2013 to 2015

Organization: Department of the Interior
Dataset Last Updated: August 13, 2020 at 12:00 AM

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...

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Search relevance: 1.00 | Views last month: 3 | Catalog Last Checked: September 10, 2026 at 09:01 PM

#3 Federal

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)

Organization: Department of the Interior
Dataset Last Updated: January 29, 2021 at 12:00 AM

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...

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Search relevance: 1.00 | Views last month: 3 | Catalog Last Checked: September 10, 2026 at 08:17 PM

#4 Federal

Estimated Groundwater Withdrawals from Principal Aquifers in the United States—County Level Data for 2015

Organization: Department of the Interior
Dataset Last Updated: August 21, 2020 at 12:00 AM

This dataset contains estimates of water withdrawals from 66 principal aquifers and "other" non-principal aquifers during 2015 for various categories of use in each county or county equivalent in...

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Search relevance: 1.00 | Views last month: 3 | Catalog Last Checked: September 10, 2026 at 10:12 PM

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Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025)

Datasets from Groundwater-Quality and Select Quality-Control Data from the National Water-Quality Assessment Project, January through December 2016, and Previously Unpublished Data from 2013 to 2015

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)

Estimated Groundwater Withdrawals from Principal Aquifers in the United States—County Level Data for 2015