Gilleland Creek

A volunteer collecting data in the Gilleland Creek watershed

See Also:

---

TMDL Home

TMDL Projects

TMDL News

Watershed County: Travis
Parameter: Bacteria
River Basin: Colorado
Segment: 1428C

On this page:

• Overview and Goal
• Watershed Description
• Get Involved 
• Approved I-Plans
• Adopted TMDL
• Contact the TMDL Program

Overview and Goal

Water quality testing found that bacteria concentrations are elevated in Gilleland Creek, located in northeastern Travis County. High bacteria concentrations might pose a risk to people who swim or wade in the creek, activities referred to as “contact recreation” in the state’s water quality standards.

In response, TCEQ developed a TMDL to determine the amount, or load, of a pollutant that a body of water can receive and still support its designated uses. The allowable load was then allocated among categories of sources within the watershed. Stakeholders also developed an I-Plan with measures that aim to reduce pollutant loads. In 2016, stakeholders revised the I-Plan with adjustments needed to continue water quality improvements in the watershed.

The goal of this project is to reduce bacteria concentrations to within acceptable risk levels for contact recreation.

Watershed Description

Gilleland Creek is located in central Texas, where its watershed flows through about 76 square miles flowing through Travis County. Land use in the watershed is transitioning from agricultural to urban. The results of urbanization are most evident during dry weather, when the water in Gilleland Creek is dominated by wastewater effluent from the municipal wastewater treatment facilities (WWTFs) in the watershed. The watershed includes the City of Pflugerville, a small portion of the City of Round Rock, and portions of the cities of Manor and Austin.

Watershed Photos

• 2013 Stormwater Basin Retrofit Study
• 2008 Gilleland Bacteria Survey

Get Involved

TCEQ worked with a stakeholder group coordinated by the Lower Colorado River Authority to develop the TMDL and original I-Plan. In 2017, stakeholders revised the I-Plan, with facilitation from the Center for Public Policy Dispute at the University of Texas School of Law. Find out more about what it means to participate in TMDL projects. 

Partners

The organizations listed below are partners in improving the water quality in Gilleland Creek.
All of the links in this section exit the TCEQ website.

Approved I-Plans

I-Plans are developed by watershed stakeholders, usually for five-year terms. Stakeholders meet regularly throughout implementation of the plan to review their progress. 

Revised I-Plan, 2017

Stakeholders developed a revised I-Plan for activities for 2018 through 2022 and submitted it to TCEQ on Nov. 16, 2017.

•  Revised Implementation Plan for One TMDL for Bacteria in Gilleland Creek

Original I-Plan 2011

The Commission approved the original I-Plan on Feb. 9, 2011.

•  I-Plan for One TMDL for Bacteria in Gilleland Creek  
•  Response to Public Comment on the I-Plan

Status

TCEQ coordinates regular meetings with stakeholders to assess their progress implementing their I-Plan and discuss changes in the watershed. If water quality goals have not been met by the time a plan is completed, stakeholders may choose to form a new committee to develop a revised plan covering another five-year term. The stakeholders' welcome comments on the current I-Plan at any time; email comments to tmdl@tceq.texas.gov with "Gilleland Creek" in the subject line.

• 2021, Fourth Year Implementing Revised Plan
  •  Meeting Summary
  •  Status Summary
  •  Watershed Map, April 2021
• 2020, Third Year Implementing Revised Plan
  
  •  Meeting Summary
  •  Status Summary 
  •  Watershed Map, April 2020 
  •  Chart of Bacteria Geomeans in Gilleland Creek, April 2020 
  •  Chart of Geomeans at All Sites over Time 
  •  Follow-up on Action Items 
• 2019, Second Year Implementing Revised Plan
  
  •  Meeting Summary 
  •  Status Summary 
  •  Watershed Map, April 2019 
  •  Assessment Units and Geomeans from the Texas Integrated Report 
  •  Chart of Geomeans over Time 
• 2018, First Year Implementing Revised I-Plan
•  2018 Status Summary 
•  Assessment Units and Geomeans from the Texas Integrated Report 
• 2016 and 2017
• Stakeholders worked from fall of 2016 through November 2017 to revise the Implementation Plan. See the revised plan in the Adopted TMDL section below. Progress on their original plan is summarized in the Revised Implementation Plan.
• 2015, Fifth Year Implementing the Plan
•  Year Five Summary Presentation
•  Meeting Summary
• 2014, Fourth Year Implementing the Plan
•  Year Four: Status Summary
•  NPS Stormwater Retrofit Final Report
• 2013, Third Year Implementing the Plan
•  Year Three: Status Summary
•  Year Three Summary Presentation
• 2012, Second Year Implementing the Plan
  •  Year Two: Status Summary
  •  Year 2 Summary Presentation
• 2011, First Year Implementing the Plan
  •  Year One: Status Summary
  •  Year One Summary Presentation

Activities

In 2013, the Austin City Council passed a comprehensive overhaul of the city's Watershed Protection Ordinance . At the core of the ordinance were three interrelated changes: better stream buffers, improved floodplain protections, and new erosion hazard provisions. The ordinance extended creek buffers—setbacks to ensure that development is not built too close to waterways—for over 400 miles of smaller “headwaters” streams.

On August 14, 2012, the Travis County Commissioners’ Court approved  requirements to establish stream setbacks applicable to development in all unincorporated areas of the watershed.

Adopted TMDL

The Commission adopted this TMDL on Aug. 8, 2007. EPA approved it on April 21, 2009, at which time it became part of the state’s Water Quality Management Plan.

•  One TMDL for Bacteria in Gilleland Creek
  Segment 1428C
•  Response to Public Comment on the TMDL

Updates to TMDLs

From time to time, it is necessary to revise TMDLs to account for changing conditions in the watershed, such as new or amended permits, or urban growth, or to correct oversights in the original TMDL report. Revisions to the load allocations in TMDLs are made via the state’s WQMP, which is updated quarterly.

The WQMP provides projected effluent limits for use in planning and permitting activities under the Texas Pollutant Discharge Elimination System (TPDES). TCEQ reviews all applications for new and amended permits for conformance with applicable portions of the WQMP, including adopted TMDLs.

Learn more about WQMP updates and about opportunities to comment on revisions to them.

Updates

• July 2019, Appendix II, pages 15-16
• July 2011, Appendix II, page 13
• October 2009, Appendix I, page 13
• April 2009, Appendix II, pages 16-17
• January 2008, pages 12-13

WQMP updates may be viewed in person at the TCEQ Library, Building A, 12100 Park 35 Circle, Austin, Texas. Electronic versions of updates published from 2014 through the present are available on the Texas State Library and Archives Commission website .

For WQMP updates prior to 2014, use the TRAIL Search  engine as outlined below. The main search box on the page will only conduct a simple search with no exclusionary parameters and should not be used.

1. First, limit your search to TCEQ only. Do this via the advanced search feature on the left of the page. To limit a search to TCEQ content, enter "www.tceq.texas.gov" or "www.tceq.state.tx.us" into the “From the Host” search box.
2. Refine your search to narrow down results. The other search boxes on the left of the page allow for search terms to be included, excluded, or used in an exact phrase search. Date ranges can be used as well.

Contact the TMDL Program

Please email tmdl@tceq.texas.gov, and mention the Gilleland Creek bacteria project in the subject line. Or call us at 512-239-6682.

Back to top