Environmental Geology and Water Sciences

, Volume 17, Issue 1, pp 17–22

A scientifically based nationwide assessment of groundwater quality in the United States

  • William M. Alley
  • Philip Cohen

DOI: 10.1007/BF01716071

Cite this article as:
Alley, W.M. & Cohen, P. Environ. Geol. Water Sci (1991) 17: 17. doi:10.1007/BF01716071


Beginning in 1986, the U.S. Geological Survey began an effort to develop a National Water-Quality Assessment Program. The basic premise underlying this initiative is that a better understanding of the quality of water resources across the country, both surface- and groundwater, is needed to develop effective programs and policies to meet the nation's water-quality concerns. The program will focus on water-quality conditions that are prevalent or large in scale, such as occur from nonpoint sources of pollution or from a high density of point sources.

The design of the program is substantially different from the traditional approach of a diffuse national monitoring network.

The major activities of the assessment program will be clustered within a set of hydrologic systems (river basins and aquifer systems), referred to as study units. In aggregate, the study units will account for a large part of the nation's water use and represent a wide range of settings across the country.

Unique attributes of the program include: (1) the use of consistent study approaches, field and laboratory methods, water-quality measurements, and ancillary data measurements for all study units; (2) the development of a progressive understanding of water-quality conditions and trends in each study unit through long-term studies that rotate periods of intensive data collection and analysis with periods during which the assessment activities are less intensive; and (3) the focus of considerable effort on synthesizing results from among the study units to provide information on regional and national water-quality issues.

Copyright information

© Springer-Verlag New York Inc 1991

Authors and Affiliations

  • William M. Alley
    • 1
  • Philip Cohen
    • 1
  1. 1.U.S. Geological SurveyRestonUSA

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