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You are here: Home / Water Quality / Total Maximum Daily Load Program / Dallas and Tarrant Counties: A TMDL Project for Legacy Pollutants

Dallas and Tarrant Counties: A TMDL Project for Legacy Pollutants

A completed total maximum daily load (TMDL) project to reduce legacy pollutant loads in streams and rivers in Dallas and Tarrant Counties.
photo of Lake Worth
Lake Worth
Photograph courtesy of the Fort Worth Water Department


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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.

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Adopted TMDLs

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.

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Implementation Plan

The TCEQ approved the Implementation Plan in August 2001.

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For More Information

Please e-mail us at tmdl@tceq.texas.gov and mention the Dallas and Tarrant Counties TMDL project in the subject line. Or call us at 512-239-6682.

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