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Contamination of surface and ground water from nonpoint sources is a national issue. Examples of nonpoint-source contaminants from agricultural activities are pesticides (fungicides, herbicides, and insecticides), sediments, and nutrients (nitrate and phosphorus). The Platte River Valley in Nebraska (fig. 1) is a flat lowland area underlain primarily by unconsolidated alluvial deposits of Quaternary age that have a maximum thickness of less than 100 ft (feet) and consist mostly of gravel, sand, silt, and clay (Gutentag and others, 1984, p. 9). These deposits are the single most important source of water for public supply for Nebraskas largest cities including Omaha, Lincoln, Grand Island, and Kearney. These deposits proSIGNIFICANT FINDINGS

Shallow ground-water quality in the Platte River Valley alluvium, Nebraska, October-November 1997