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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

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

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Background and Goals

In seven streams in the San Antonio, Brazos, and Guadalupe River Basins, TCEQ water quality assessment as of 2004 found concentrations of bacteria that might 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 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) during Phase I indicated that the segment was meeting the applicable criteria; consequently, no TMDL was developed. In Phase II of the project, TCEQ formed four additional projects 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 four new projects to develop the necessary TMDLs. Get information on those projects by following the links below.

  • Leon River below Proctor Lake (Segment 1221) did not result in a TMDL, based on additional information collected during Phase II and stakeholder advice
  • Peach Creek (Segment 1803C) did not result in a TMDL, based on additional information collected during Phase II and stakeholder advice
  • Lower San Antonio River (Segment 1901)
  • Upper San Antonio River (Segments 1910, 1910A, and 1911)

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Contact the TMDL Program

Email tmdl@tceq.texas.gov and mention the San Antonio–Leon–Peach assessment project in the subject line. Or call us at 512-239-6682.

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