USGS Water-Quality Information
USGS personnel collect a water-quality sample on the Missouri River. USGS/Photo by Kelly Brady.
Water Quality Data
Today's Water Conditions
Get continuous real-time water-quality measurements from Water-Quality Watch maps.
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
USGS in Your Area
USGS Water Science Centers are located in each state.
USGS Water-Quality Data
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.
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).
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:
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.
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.
The Water Quality Portal (WQP) 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.
Additional USGS Water-Resources Data
The Water Data Discovery web site provides an overview of all USGS water-resources data.
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 provides machine-readable water data through automated web services and Extensible Markup Language (XML).
The Maps and GIS page provides a list of water-resources GIS resources.
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.
Other Sources of Water-Quality and Related Data
International Water-Quality Data Resources