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USGS - Science for a Changing World
National Water-Quality Assessment Program (NAWQA)
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Assessing more than 50 river basins and aquifer systems

Map of NAWQA AssessmentsIn more than 50 major river basins and aquifers covering nearly all 50 states, USGS scientists collect and interpret data about water chemistry, hydrology, land use, stream habitat, and aquatic life.
Activities by state:

Activities by basin:

How and why water quality varies across the Nation
crop dusting
drinking water

Each assessment adheres to a nationally consistent study design which allows comparisons among river basins and comprehensive national evaluations of:

Informing decision makers about water resources

Information from the NAWQA program is used by decision makers at all levels—local, state, interstate, and national—to address and prioritize water-resource issues related to:

Summary reports, written primarily for decision makers, discuss national findings from individual river basins and aquifers and relate these findings to national assessments.

What's New - Newest Activities pertaining to the NAWQA program. For a full list, visit the archive.


 U.S. Department of the Interior, U.S. Geological Survey
 Contact for NAWQA:
 Maintainer: James Ulrich-
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 Last Update: 07:45:36 Wed 20 Oct 2004