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Ground water is the primary source of drinking water in the Republican River Basin. Hydrogeologic conditions, at least in some areas, are such that the potential exists for ground-water contamination by agricultural chemicals dissolved in infiltrating water. No study of nitrate concentrations in the Nebraska part of the Republican River Basin has been done recently using uniform collection and analysis techniques. For these reasons, the U.S. Geological Survey (USGS), in cooperation with the Nebraska Republican River Management Districts (the Upper Republican, Middle Republican, Lower Republican, and Tri-Basin Natural Resources Districts (NRDs) and the Frenchman-Cambridge, Frenchman Valley, Hitchcock and Red Willow, and Nebraska Bostwick Irrigation Districts) and the Southwest Nebraska Resource Conservation and Development Area, conducted a study of nitrate concentrations in the Nebraska part of the Republican River Basin.

Distribution of nitrate in ground water in the Republican River Basin, southwest Nebraska, 1996-98