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San Antonio River Basin, Leon River, and Peach Creek: Evaluating Water Quality for Recreation

A completed project to assess the need to develop bacteria TMDLs for the San Antonio River, Salado Creek, Walzem Creek, Leon River, and Peach Creek

photo of the Leon River
Leon River

Counties: Bastrop, Bexar, Caldwell, Comanche, Coryell, DeWitt, Erath, Fayette, Goliad, Gonzales, Guadalupe, Hamilton, Karnes, Mills, Refugio, Victoria, Wilson
Parameter: Bacteria
River Basins: San Antonio, Guadalupe, Brazos
Segments: 1221, 1803C, 1901, 1910, 1910A, 1911

On this page:

Background and Goals

In seven streams in the San Antonio, Brazos, and Guadalupe River Basins, water quality testing found concentrations of bacteria that may pose a health risk for swimmers. Swimming and other forms of recreation in which people come into direct contact with the water are called “contact recreation” in the state’s standards for water quality.

The goal of this project was to evaluate the need for TMDLs to reduce bacteria concentrations to within acceptable risk levels in the affected segments—the Medina River below the Medina Diversion Lake (Segment 1903), the Leon River below Proctor Lake (Segment 1221), Peach Creek (Segment 1803C), San Antonio River (Segment 1901), Salado Creek (Segment 1910), Walzem Creek (Segment 1910A), and Upper San Antonio River (Segment 1911).

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Phase I: Evaluation

Additional data collected from the Medina River below the Medina Diversion Lake (Segment 1903) indicated that the segment is meeting the applicable criteria; consequently, no TMDL was developed. In Phase II of the project, TCEQ formed four additional project to develop TMDLs for the other six segments (see below).

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Phase II: TMDL Development

Because of the geographic separation among the watersheds, the TCEQ formed subprojects to develop the necessary TMDLs. Get information on development of the TMDLs by following the links below.

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For More Information

Please e-mail us at, and reference the San Antonio–Leon–Peach assessment project in the subject line. Or call us at 512-239-6682.

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communities working together taking care of our rivers, lakes, and bays