National Water-Quality Assessment (NAWQA) Program

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General Information

Sites for Regional and National Monitoring and Assessments of Streams and Rivers

MRB sites
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The number of sites in NAWQA’s status and trends network totals 113 across the 8 major river basins.

Twelve of the current sites monitor conditions in large rivers that drain major agricultural and urban areas throughout the Nation. These sites represent predominant crops within each of the eight regions and urban centers in four of the regions. They include:

Agricultural

      Potomac River at Washington, D.C.

      Neuse River at Kinston, North Carolina

      White River at Hazleton, Indiana

      Platte River at Louisville, Nebraska

      Yazoo River near Long Lake, Mississippi

      Rio Grande at El Paso, Texas

      Willamette River at Portland, Oregon

      San Joaquin River near Vernalis, California

Urban

      Raritan River at Bound Brook, New Jersey

      Chattahoochee River near Whitesburg, Georgia

      Trinity River below Dallas, Texas

      Santa Ana River below Prado Dam, California

The remaining sites represent smaller urban or agricultural watersheds. NAWQA’s surface-water sites will have been monitored consistently for more than a decade, and therefore will be critical in determining trends in nutrients and pesticides. In addition, the sites will address specific issues, such as runoff and transport of nutrients and pesticides in urban areas, and the effect of soil type, irrigation, and artificial drainage on pollutant transport in agricultural areas. 

The NAWQA monitoring network uses a rotational sampling scheme; therefore, sampling intensity varies year to year at the different sites.

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