Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present
type: Dataset
description: Groundwater samples were collected and analyzed from 417 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 indicators and constituents, including major ions, nutrients, trace elements, volatile organic compounds (VOCs), pesticides, radionuclides, and microbial indicators. Data from samples collected between 2012 and 2019 are associated with networks described in a collection of data series reports and associated data releases (Arnold and others, 2016a,b, 2017a,b, 2018a,b; Kingsbury and others, 2020 and 2021). This data release includes data from networks sampled in 2019 that were not previously published and available data for networks sampled in 2020. For some networks, certain constituent group data were not completely reviewed and released by the analyzing laboratory in time for publication of this data release. For networks with incomplete data, no data were published for the incomplete constituent group(s). Datasets excluded from this data release because of incomplete results will be included in the earliest data release published after the dataset is complete. The compressed file (NWQP_GW_QW_DataRelease.zip) contains 23 files of groundwater-quality, quality-control data, and general information in ASCII text tab-delimited format, and one corresponding metadata file in xml format that includes descriptions of all the tables and attributes. A shapefile …
issued: 2025-11-20T04:15:40.030882
modified: 20211206
spatial: Location
contact point: Organization
  fn: Amy C. Gill
keyword: amerigeo
keyword: amerigeoss
keyword: ckan
keyword: cycle-3
keyword: domestic-supply
keyword: geo
keyword: geoss
keyword: groundwater
keyword: inlandwaters
keyword: national
keyword: nawqa
keyword: north-america
keyword: principal-aquifer
keyword: public-water-supply
keyword: united-states
keyword: usgs-606f0b21d34ef99870188821
keyword: water-quality
theme: {geospatial}

Digital Data
type: Distribution
description: Landing page for access to the data
format: XML
issued: 2022-08-06T19:42:51.401951
modified: 2025-11-20T04:15:40.021564
access URL: https://doi.org/10.5066/P9J7I9DH
media type: application/http

Original Metadata
type: Distribution
description: The metadata original format
format: XML
issued: 2022-08-06T19:42:51.401945
modified: 2025-11-20T04:15:40.021156
access URL: https://data.usgs.gov/datacatalog/metadata/USGS.606f0b21d34ef99870188821.xml
media type: text/xml

US Migrating
type: Agent