USGS

National Water-Quality Assessment Program

Nutrients in the Nation's Waters--Too Much of a Good Thing?

By David K. Mueller and Dennis R. Helsel

U.S. Geological Survey Circular 1136

Published 1996.

CONTENTS

Foreword
Introduction
Major findings
What parts of the Nation are most affected?
What are nutrients?
Are drinking-water supplies affected? What information can science provide for policy decisions?
What are the concerns about nutrients in water? What are the sources of nutrients in water? How large are natural concentrations of nutrients in water?
What are the major influences on nutrients concentrations in water? Is the nutrient situation getting better or worse? Where can I get more information?
Other publications referred to in the report
A coordinated effort
Publications of the National Water-Quality Assessment (NAWQA) Program related to data used in this report
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