USGS Iowa WSC's David Warweg collects a water-quality sample at the South Fork of the Iowa River, a NAWQA site. USGS/Photo by Tyler Rokes.
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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
View a complete list of USGS water-quality data resources.
USGS Water Science Areas
USGS Water-Quality Information Pages
The U.S. Geological Survey provides scientific and technical expertise, leadership, and coordination in addressing issues concerning the quality of the Nation's water resources. Our scientists:
- Collect, analyze, and interpret water-quality data.
- Engage in field and laboratory research and methods development.
- Work with local, State, and Federal agencies and the citizenry to identify and understand environmental issues and concerns.
Assessing Our Nation's Water Quality
Map of median concentrations of sodium in groundwater in New Hampshire, using well data reported in 1995 and 2005.
USGS Responds to Water-Quality Hazards
The USGS responds to major events, including natural hazards, that can affect our Nation's water quality by working with local, State, and Federal agencies and the citizenry to identify, quantify, and understand environmental issues and concerns.
USGS collects data and information on topics such as the transport, fate, and remediation of contaminants. Learn more about:
More water quality topics...
USGS in Your Area
Learn more about local water quality by visiting the web site for the USGS Water Science Center located in your state: