Colorado River and Petronila Creek: A TMDL Project for Total Dissolved Solids

Counties: Coke, Runnels, Nolan, Taylor, Jim Wells, Kleberg, Nueces
Parameters: Chloride, Sulfate, Total Dissolved Solids (TDS)
River Basin: Colorado River, Nueces-Rio Grande Coastal
Segment: 1426, 2204

photo of the Colorado River Below E.V. Spence Reservoir
Colorado River
Below E.V. Spence Reservoir

Background and Goals

In several streams in Texas, water quality testing found elevated levels of chloride, sulfate, and total dissolved solids (TDS). High concentrations of these salts are indicators of general water quality that are not tied to evaluation of a specific beneficial use such as the support of aquatic life.

The purpose of this project was to evaluate the extent of the problem in the project water bodies to determine if TMDLs were necessary. Project staff determined that TMDLs were needed for the Colorado River Below E.V. Spence Reservoir (Segment 1426) and Petronila Creek (Segment 2204). Data collected from the San Gabriel River (Segment 1214) and Brushy Creek (Segment 1244) indicate that these segments are meeting the applicable criteria; consequently, they were removed from the state's list of impaired waters in 2002.

return to top Return to top

Public Participation

Stakeholder groups have been established to advise the TCEQ on the development of TMDLs for Petronila Creek and the Colorado River Below E.V. Spence Reservoir.

return to top Return to top

Colorado River TMDLs and I-Plan

The commission adopted two TMDLs for the Colorado River on February 7, 2007. The TMDLs will become part of the state's Water Quality Management Plan upon approval by the United States Environmental Protection Agency (EPA).

I-Plan

The commission approved the I-Plan on October 10, 2007.

return to top Return to top

Petronila Creek TMDLs and I-Plan

The commission adopted three TMDLs for Petronila Creek on January 10, 2007. The EPA approved the TMDLs on March 14, 2007, at which time they became part of the state's Water Quality Management Plan.

I-Plan

The commission approved the I-Plan on October 10, 2007.

return to top Return to top

For More Information

For additional information regarding stakeholder committees, please contact Earlene Lambeth at 512/239-3129. For technical information about this project, contact Kerry Niemann at 512/239-0483. Or e-mail us at tmdl@tceq.state.tx.us, and reference the Colorado and Petronila TMDL project in the subject line.

return to top Return to top