Upper Illinois River Basin

Fact Sheet 072-98
National Water-Quality Assessment Program



During the past 25 years, industry and government made large financial investments that resulted in better water quality across the Nation; however, many water-quality concerns remain. Following a 1986 pilot project, the U.S. Geological Survey began implementation of the National Water-Quality Assessment (NAWQA) Program in 1991. This program differs from other national water-quality assessment studies in that the NAWQA integrates monitoring of surface- and ground-water quality with the study of aquatic ecosystems. The goals of the NAWQA Program are to (1) describe current water-quality conditions for a large part of the Nation's freshwater streams and aquifers (water-bearing sediments and rocks), (2) describe how water quality is changing over time, and (3) improve our understanding of the primary natural and human factors affecting water quality.

The Upper Illinois River Basin National Water- Quality Assessment (NAWQA) study will increase the scientific understanding of surface- and ground-water quality and the factors that affect water quality in the basin. The study also will provide information needed by water-resource managers to implement effective water-quality management actions and evaluate long-term changes in water quality.

Suggested Citation

Friedel, M.J., 1998, Upper Illinois River basin: U.S. Geological Survey Fact Sheet 072–98; 4 p.,

ISSN: 2327-6932 (online)

Study Area

Table of Contents

  • What is the National Water-Quality Assessment Program?
  • Study Unit Description
  • Assessing Water Quality in the Upper Illinois River Basin Study Unit
Publication type Report
Publication Subtype USGS Numbered Series
Title Upper Illinois River basin
Series title Fact Sheet
Series number 072-98
DOI 10.3133/fs07298
Year Published 1998
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Illinois Water Science Center
Description 4 p.
Country United States
State Illinois, Indiana, Wisconsin
Google Analytic Metrics Metrics page
Additional publication details