Water Quality in the Trinity River Basin, Texas, 1992-95 By Larry F. Land, J. Bruce Moring, Peter C. Van Metre,  David C. Reutter, Barbara J. Mahler, Allison A. Shipp,  and Randy L. Ulery U.S. GEOLOGICAL SURVEY  CIRCULAR 1171

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CONTENTS

• National Water-Quality Assessment Program
• Summary of Major Issues and Findings in the Trinity River Basin
• Environmental Setting and Hydrologic Conditions in the Trinity River Basin
• Major Issues and Findings

• Nutrients in Streams

• Pesticides in Streams

• Determining Water-Quality Trends Using Sediment Cores, White Rock Lake, Dallas

• Organochlorines in Streambed Sediments and Aquatic Biota

• Stream-Habitat Characteristics and Fish-Community Degradation

• Stream-Habitat Characteristics

• Fish-Community Degradation

• Use of a New Method, Semipermeable Membrane Device (SPMD), to Assess the Occurrence of Water-Borne Polycyclic Aromatic Hydrocarbons (PAHs) in Streams

• Fish-Community Changes Reflect Water-Quality Improvements in the Trinity River Downstream From Dallas

• How Has the Water Quality Improved?

• How Has the Fish Community Changed as a Result?

• Quality of Ground Water in Aquifer Outcrops

• Trinity Aquifer

• Woodbine Aquifer

• Carrizo-Wilcox Aquifer

• Gulf Coast Aquifer

• Water-Quality Conditions in a National Context

• Comparison of Trinity River Basin Study Unit Surface-Water Results with Nationwide NAWQA Findings

• Comparison of Trinity River Basin Study Unit Ground-Water Results with Nationwide NAWQA Findings

• Study Design and Data Collection in the Trinity River Basin

• Summary of Compound Detections and Concentrations

• References

• Glossary

Coordination among agencies and organizations is an integral part of the NAWQA Program. We thank the following agencies and organizations who contributed through their participation in the Study Unit Liaison Committee.

Federal Agencies: U.S. Army Corps of Engineers U.S. Department of Agriculture, Natural Resources Conservation Service U.S. Department of the Interior, Bureau of Reclamation U.S. Environmental Protection Agency U.S. Fish and Wildlife Service	Local Organizations: City of Arlington City of Fort Worth City of Irving Dallas Water Utilities Department Tarrant County Water Control and Improvement District No. 1 Trinity River Authority
State Agencies: Railroad Commission of Texas Texas Department of Agriculture Texas Natural Resource Conservation Commission Texas Parks and Wildlife Department Texas State Soil and Water Conservation Board Texas Water Development Board	Universities and other organizations: Galveston Bay National Estuary Program North Central Texas Council of Governments Texas Water Resources Institute University of North Texas University of Texas at Austin

FOR ADDITIONAL INFORMATION ON THE 
NATIONAL WATER-QUALITY ASSESSMENT (NAWQA) PROGRAM:

Trinity River Basin Study Unit, contact:

District Chief U.S. Geological Survey Water Resources Division 8011 Cameron Rd. Austin, TX 78754

Chief, NAWQA Program U.S. Geological Survey Water Resources Division 12201 Sunrise Valley Drive, M.S. 413 Reston, VA 20192

Information on the NAWQA Program is also available on the Internet via the World Wide Web. You may connect to the NAWQA Home Page using the Universal Resources Locator (URL): http://water.usgs.gov/nawqa/

The Trinity River Basin Study Unit's Home Page is at URL: http://tx.usgs.gov/trin/

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U.S. Department of the Interior, U.S. Geological Survey Persistent URL: http://pubsdata.usgs.gov/pubs/circ/circ1171/ Page Contact Information: USGS Publishing Network Last modified: Wednesday, November 23 2016, 12:09:22 PM

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