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  • Notice - The USGS Water Resources Mission Area's priority is to maintain the safety and well-being of our communities, including providing critical situational awareness in times of flooding in all 50 U.S. states and additional territories. Our hydrologic monitoring stations continue to send data in near real-time to NWISWeb, and we are continuing critical water monitoring activities to protect life and property on a case-by-case basis. The health and safety of the public and our employees are our highest priorities, and we continue to follow guidance from the White House, the CDC, and state and local authorities.

  • Introducing The Next Generation of USGS Water Data for the Nation
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Water Quality Samples for the Nation

Some complex retrievals may take a few minutes.
Choose Site Selection Criteria
There are 422,054 sites with water-quality data. Choose at least one of the following criteria to constrain the number of sites selected.

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          Site
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          Data
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* Selection of more than one data attribute will include all samples that meet all conditions selected.