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USGS Water-Quality Information

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 [Photo: USGS scientists collect water-quality samples.]

USGS personnel collect a water-quality sample on the Missouri River. USGS/Photo by Kelly Brady.


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Water Quality Data

Today's Water Conditions

Get continuous real-time water-quality measurements from Water-Quality Watch maps.
[Sample Water-Quality Watch Map]

Water Quality Portal (WQP)

Get current and historical USGS and EPA water-quality data at the WQP.


Get stream ecosystem aquatic bioassessment data from BioData.

For More Data

View a complete list of USGS water-quality data resources.

USGS in Your Area

USGS Water Science Centers are located in each state.

 [Map: There is a USGS Water Science Center office in each State.] Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Water-Quality Data

USGS Water-Quality Data

USGS Online Water-Quality Data (NWIS)

 [Image: Sample graph.] The USGS collects and analyzes chemical, physical, and biological properties of water, sediment and tissue samples from across the Nation. The National Water Information System (NWIS) includes current and historical water-quality data and related summary statistics.

WaterQuality Watch

[Sample Water-Quality Watch Map]Water-Quality Watch provides continuous real-time water-quality measurements from USGS surface-water monitoring locations.

Water-Quality Web Services

[Water-Quality Web Services Web Site]Web services automate the sharing of USGS and U.S. Environmental Protection Agency water-quality monitoring data.


 [Map: USGS WaterAlert Data Stations] The USGS WaterAlert service sends e-mail or text messages when certain parameters measured by a USGS data-collection station exceed thresholds set by the user. Alerts are available for selected USGS groundwater, surface-water, water-quality, and precipitation data-collection stations that are part of the National Water Information System (NWIS).

National Water-Quality Assessment (NAWQA)

 [Map: Sample map from NAWQA Data Warehouse] The NAWQA Program investigates the status of water-quality conditions and studies how and why these conditions change over time. Most NAQWA data are included in NWIS, but additional data products and databases are available:

  • NAWQA Data Warehouse, which includes chemical, biological, and physical water-quality data from across the Nation.
  • National maps, which summarize particular data sets or investigations from featured NAWQA activities.

National Stream Quality Accounting Network (NASQAN)

 [Image: NASQAN homepage] The NASQAN Program reports on concentrations and loads of selected constituents delivered by major rivers to coastal waters and selected inland sub-basins.

National Atlas - Water

 [Map: Sample map from National Atlas] National Atlas map layers include some datasets for water quality in the United States, viewable online or downloadable as GIS data sets.

National Atmospheric Deposition Program (NADP)

 [Map: Sample wet atmospheric deposition data map] The USGS is the lead federal agency for the monitoring of chemical constituents deposited from the atmosphere via rain, sleet, and snow, also known as wet atmospheric deposition. The NADP monitors wet atmospheric deposition at over 250 sites throughout the Nation.

Hydrologic Benchmark Network (HBN)

 [Image: Sample graph.] The HBN program collects data from a long-term network of sites located in areas that are minimally affected by human activities. Links are provided to access water-quality data from individual network sites.

Water Quality Portal

The Water Quality Portal (WQP) [Link exits the USGS web site] provides access to over 150 million water-quality records in the USGS NWIS and the U.S. Environmental Protection Agency (EPA) STOrage and RETrieval (STORET) data bases. The portal is a sponsored by the USGS, the EPA, and the National Water Quality Monitoring Council (NWQMC).

Water-Quality Data by State

USGS Water Science Centers located across the United States may have additional information or resources for local water-quality data. Visit your local USGS Water Science Center web site for more information.

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Additional USGS Water-Resources Data

Water Data Discovery

The Water Data Discovery web site provides an overview of all USGS water-resources data.

Suspended-Sediment Database

The Suspended-Sediment Database provided daily values of suspended sediment and ancillary data through September 30, 1996. More current data are included in NWIS.

USGS Water Data Web Services & XML

USGS provides machine-readable water data through automated web services and Extensible Markup Language (XML).

Water Resources Maps and GIS Information

The Maps and GIS page provides a list of water-resources GIS resources.

USGS Groundwater Watch

The Groundwater Watch web sites group related wells and data from National Water Information System (NWIS) active well networks and provide basic statistics about the water-level data.

Interdisciplinary Water Quality Data

Studies conducted by other USGS disciplines may also include the collection of water-quality data. For information on additional data available, refer to the Geology Discipline data page or the National Biological Information Infrastructure Data & Tools section.

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Other Sources of Water-Quality and Related Data

Government Data

International Water-Quality Data Resources

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Page Contact Information: USGS Office of Water Quality
Page Last Modified: Thursday, 08-May-2014 18:25:25 EDT