Dallas and Tarrant Counties: A TMDL Project for Legacy Pollutants
Photograph courtesy of the Fort Worth Water Department
Counties: Dallas, Tarrant
Parameters: chlordane, DDT, DDD, DDE, dieldrin, heptachlor epoxide, and polychlorinated biphenyls (PCBs) in fish tissue
Basin: Trinity River
Segments: 0805, 0841, 0841A
Background and Goals
Seven legacy pollutants were detected in fish tissues in portions of the Upper Trinity River, the Lower West Fork Trinity River, and Mountain Creek Lake, all in the Dallas area. Legacy pollutants are chemicals whose use has been banned or severely restricted, but which still remain in the environment. The pollutants involved include chlordane, DDT, DDD, DDE, dieldrin, heptachlor epoxide, and PCBs, most of which were once used as insecticides. The goal of this TMDL project is the reduction of concentrations of fish-tissue contaminants to levels that constitute an acceptable risk to consumers. All the pollutants in the TMDL, with the exception of PCBs in Mountain Creek Lake, have been addressed. Legacy insecticides are no longer considered a risk to consumers of fish from these areas.
The TCEQ adopted these TMDLs on December 20, 2000. The EPA approved these TMDLs on June 27, 2001, at which time they became part of the state's Water Quality Management Plan.
- Nine Total Maximum Daily Loads for Legacy Pollutants in Streams and a Reservoir in Dallas and Tarrant Counties
The TCEQ approved the Implementation Plan in August 2001.
- Implementation Plan for Dallas and Tarrant County Legacy Pollutant TMDLs
- Response to Public Comment on the Dallas and Tarrant County Implementation Plan
For More Information
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