Fact Sheet 2007–3088
In 1991, the U.S. Geological Survey (USGS) began studies of 51 major river basins and aquifers across the United States as part of the National Water-Quality Assessment (NAWQA) Program to provide scientifically sound information for managing the Nation’s water resources. The major goals of the NAWQA Program are to assess the status and long-term trends of the Nation’s surface- and ground-water quality and to understand the natural and human factors that affect it (Gilliom and others, 1995).
In 2001, the NAWQA Program began a second decade of intensive water-quality assessments. The 42 study units for this second decade were selected to represent a wide range of important hydrologic environments and potential contaminant sources. These NAWQA studies continue to address the goals of the first decade of the assessments to determine how water-quality conditions are changing over time. In addition to local- and regional-scale studies, NAWQA began to analyze and synthesize water-quality status and trends at the principal aquifer and major river-basin scales.This fact sheet summarizes results from four NAWQA studies that relate water quality to agricultural chemical use and environmental setting at these various scales:
Posted November 2008
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U.S. Geological Survey, 2008, Relations of water quality to agricultural chemical use and environmental setting at various scales—Results from selected studies of the National Water-Quality Assessment Program: U.S. Geological Survey Fact Sheet 2007–3088, 6 p.