REVIEWERS: Sandy (Alex K.) Williamson, NAWQA national database team leader, and Nate Booth, NAWQA national database technical leader for the USGS, Water Resources Division.

BACKGROUND: Repeated evaluations of water-quality information have concluded that the United States needs long-term national water-quality assessment to support effective water policy and management. In 1991, the U.S. Geological Survey (USGS) began its National Water Quality Assessment (NAWQA) Program to systematically collect chemical, biological and physical water quality data from study units across the nation.

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