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Design of the National Water-Quality Assessment Program; occurrence and distribution of water-quality conditions

Robert J. Gilliom·William M. Alley·Martin E. Gurtz
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Abstract

The National Water-Quality Assessment Program assesses the status of and trends in the quality of the Nation's ground- and surface-water resources. The occurrence and distribution assessment component characterizes broad-scale water-quality conditions in relation to major contaminant sources and background conditions in each study area. The surface-water design focuses on streams. The ground-water design focuses on major aquifers, with emphasis on recently recharged ground water associated with human activities.

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Robert J. Gilliom, William M. Alley, Martin E. Gurtz. 1995. Design of the National Water-Quality Assessment Program; occurrence and distribution of water-quality conditions. https://doi.org/10.3133/cir1112

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