National Water-Quality Assessment Program; the Allegheny-Monongahela River Basin

Fact Sheet 137-95



In 1991, the U.S. Geological Survey (USGS) began a National Water-Quality Assessment (NAWQA) program. The three major objectives of the NAWQA program are to provide a consistent description of current water-quality conditions for a large part of the Nation's water resources, define long-term trends in water quality, and identify, describe, and explain the major factors that affect water-quality conditions and trends. The program produces water-quality information that is useful to policy makers and managers at the National, State, and local levels.

The program will be implemented through 60 separate investigations of river basins and aquifer systems called study units. These study-unit investigations will be conducted at the State and local level and will form the foundation on which national- and regional-level assessments are based. The 60 study units are hydrologic systems that include parts of most major river basins and aquifer systems. The study-unit areas range from 1,000 to more than 60,000 square miles and include about 60 to 70 percent of the Nation's water use and population served by public water supplies. Twenty studyunit investigations were started in 1991, 20 started in 1994, and 20 more are planned to start in 1997. The Allegheny-Monongahela River Basin was selected to begin assessment activities as a NAWQA study unit in 1994. The study team will work from the office of the USGS in Pittsburgh, Pa.

Suggested Citation

McAuley, S.D., 1995, National Water-Quality Assessment Program; the Allegheny-Monongahela River Basin: U.S. Geological Survey Fact Sheet 1995–0137, 2 p.,

ISSN: 2327-6932 (online)

Table of Contents

  • Description of Allegheny-Monongahela Basin
  • Major Water-Quality Issues
  • Communication and Coordination
Publication type Report
Publication Subtype USGS Numbered Series
Title National Water-Quality Assessment Program; the Allegheny-Monongahela River Basin
Series title Fact Sheet
Series number 137-95
DOI 10.3133/fs13795
Year Published 1995
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Pennsylvania Water Science Center
Description 2 p.
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details