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Watersheds Where TMDLs Are Being Implemented

Stakeholders in the watershed develop implementation plans, or I-Plans, to bring about the pollutant reductions set forth in total maximum daily loads (TMDLs). Both TMDLs and I-Plans are completed for watersheds listed on this page, and stakeholders are actively engaged in working to improve water quality. Projects are listed in alphabetical order by waterway or geographic region name.
Communities Working Together

The TMDL Program works to restore Texas waterways that have limited quality in relation to one or more of their assigned uses, such as recreation, fishing, or healthy aquatic environment.

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Title Description
Adams Bayou and Cow Bayou Watersheds: A Community Project to Protect Aquatic Life and Recreational Uses A project to reduce bacteria concentration and increase levels of dissolved oxygen to protect recreational and aquatic life uses. Total maximum daily loads (TMDLs) were developed and adopted for bacteria, dissolved oxygen, and pH. Stakeholders developed the approved implementation plan (I-Plan), which together with the TMDLs is the road map for improving water quality.
Aquilla Reservoir: Improving the Quality of Drinking Water Sources A completed TMDL project to reduce atrazine in Aquilla Reservoir, which is a source of drinking water for several communities. The adopted total maximum daily loads (TMDLs) and the approved implementation plan (I-Plan) were the road map for improving water quality in the lake.
Arenosa Creek: A Community Project to Protect Recreational Uses A project to reduce bacteria and protect recreational safety in Arenosa Creek. The stakeholders and the TCEQ developed a total maximum daily load (TMDL) and implementation plan (I-Plan), which together provide the road map for improving water quality in the creek. The TMDL is adopted and the I-Plan is approved.
Arroyo Colorado: A TMDL Project for Legacy Pollutants and Organics A completed project to reduce legacy pollution from chemicals and make it safe to eat fish from the waterways. The total maximum daily loads (TMDLs) are adopted and the implementation plan (I-Plan) is approved. Together, the TMDLs and I-Plan are the the road map for improving water quality.
Austin Area Watersheds: A Community Project to Protect Recreational Uses A community project to reduce bacteria and protect recreational safety in Waller, Walnut, and Shoal creeks and Taylor Slough in the city of Austin. The Austin community is currently working to update their Implementation Plan (I-Plan), which together with TMDLs developed by the TCEQ, provide the the road map for improving water quality. The commission adopted the TMDLs and approved the original I-Plan. The updated I-Plan currently in development will extend activities to reduce bacteria through 2027.
Carancahua Bay: A Community Project to Protect Recreational Uses A project to reduce bacteria and protect recreational safety in Carancahua Bay. The stakeholders and TCEQ developed a total maximum daily load (TMDL) and implementation plan (I-Plan), which together are the road map for improving water quality. The TMDL is adopted and the I-Plan is approved.
Carters Creek Watershed: Implementing TMDLs to Protect Recreational Uses A community project to reduce bacteria levels and protect recreational uses of the creek. Together, the adopted total maximum daily loads (TMDLs) and the approved Implementation Plan (I-Plan) are the road map to improving water quality in the creek.
Clear Creek: A TMDL Project for Volatile Organic Compounds A completed project to reduce pollution from volatile organic compounds (VOCs) that were making it unsafe to eat fish caught in the creek. The total maximum daily loads are adopted and the implementation plan is approved.
Clear Creek: A TMDL Project for Chlordane A completed project to address reduce chlordane in fish and protect the safety of consumers. The total maximum daily loads (TMDLs) are adopted and the implementation plan (I-Plan) is approved.
Colorado River Below E.V. Spence Reservoir: Implementing a Plan to Improve Water Quality A completed community project to implement total maximum daily loads (TMDLs) that reduced salinity from chloride, sulfate, and dissolved solids in the Colorado River below E.V. Spence Reservoir. The adopted TMDLs and the approved Implementation Plan (I-Plan) combined were the road map to improving water quality in the river.
Dallas and Tarrant Counties: A TMDL Project for Legacy Pollutants A completed project to reduce legacy pollutant loads in streams and rivers in Dallas and Tarrant Counties. Together, the adopted total maximum daily load (TMDL) and the approved implementation plan (I-Plan) are the road map to improving water quality.
Dickinson Bayou: Implementing a Plan to Protect Recreational Uses A community project to protect recreational uses by reducing bacteria. The total maximum daily load (TMDL) is adopted and the implementation plan (I-Plan) is approved. Together, the TMDL and I-Plan are the road map to improved water quality.
E.V. Spence Reservoir: Implementing TMDLs for Total Dissolved Solids and Sulfate A project to improve water quality by reducing total dissolved solids (TDS) and sulfate in E.V. Spence Reservoir. Together, the adopted TMDLs and the approved I-Plan are the road map to improved water quality.
Fort Worth Area: A TMDL Project for Legacy Pollution A completed project to reduce legacy pollutants. Together, the adopted TMDL and the approved I-Plan are the road map to improving water quality.
Gilleland Creek: Implementing a Plan to Protect Recreational Uses The goal of this current project is to keep recreation safe in Gilleland Creek by reducing bacteria levels. The adopted total maximum daily load (TMDL) and the approved implementation plan (I-Plan) combined are the road map to improving water quality in the creek.
Greater Trinity Region: Implementing a Plan to Protect Recreational Uses The goal of this project is reduce bacteria levels and protect recreational safety in waterways of the Dallas-Fort Worth Metroplex. The stakeholders and the TCEQ developed total maximum daily loads (TMDLs) for several river and lake segments and a regional implementation plan (I-Plan), which together are the road map to improving water quality. The TCEQ has adopted the TMDLs and approved the Implementation Plan.
Guadalupe River Above Canyon Lake: Implementing a Plan to Protect Recreational Uses A community project to keep recreation safe in this segment of the river by reducing bacteria levels. The adopted total maximum daily load (TMDL) and the approved implementation plan (I-Plan) combined are the road map to improving water quality in the creek.
Houston-Galveston Region BIG: Implementing a Plan to Protect Recreational Uses The goal of this project is to reduce bacteria levels in waterways of the Houston area to make them safer for recreation. The stakeholders of the Bacteria Implementation Group (BIG) and the TCEQ developed total maximum daily loads (TMDLs) for numerous river and lake segments and a regional Implementation Plan (I-Plan), which together are the road map to improving water quality. The TCEQ has adopted the TMDLs and approved the Implementation Plan.
Lake Austin - A TMDL Project for Dissolved Oxygen A completed project to improve conditions for aquatic life by increasing dissolved oxygen in Lake Austin. Together, the adopted TMDL and the approved I-Plan are the road map to improving water quality.
Lake O' the Pines: Implementing a Plan to Protect Aquatic Life A community project to improve conditions for aquatic life by increasing dissolved oxgen levels in the lake. Together, the adopted total maximum daily loads (TMDLs) and approved implementation plan (I-Plan) are the road map to improved water quality.
Lake Worth Watershed: A TMDL Project for PCBs in Fish Tissue A completed project to improve water quality by reducing polychlorinated biphenyls (PCBs) in Lake Worth. The adopted TMDLs and approved implementation plan together are the road map to improving water quality.
Lavaca River Above Tidal and Rocky Creek: A Community Project to Protect Recreational Uses A project to reduce bacteria and protect recreational safety in the Lavaca River Above Tidal and Rocky Creek. The community has developed an Implementation Plan (I-Plan), which together with total maximum daily loads (TMDLs) developed by the TCEQ with community feedback, provide the the road map for improving water quality. The commission has adopted the TMDLs and approved the I-Plan.
Lower Sabinal River: A TMDL Project for Nitrate-Nitrogen A completed project to improve water quality in the Lower Sabinal River. The total maximum daily load (TMDL) is adopted and the implementation plan (I-Plan) is approved; together, they provide the road map for improved water quality.
Lower San Antonio River: A Community TMDL Project to Protect Recreational Uses A community project to reduce bacteria concentrations and protect recreational safety in the river. The TMDLs are adopted and the I-Plan is approved. Together, the TMDLs and I-Plan provide the road map to improving water quality.
Mission and Aransas Rivers: A Community Project to Protect Recreational Uses A community project to keep recreation safe in segments of the Mission and Aransas rivers by reducing bacteria levels. Together, the adopted total maximum daily loads (TMDLs) and approved implementation plan (I-Plan) provide the road map for improving water quality.
Navasota River: A Community Project to Protect Recreational Uses A project to reduce bacteria and protect recreational safety in the Navasota River. The community has developed an Implementation Plan (I-Plan), which together with total maximum daily loads (TMDLs) developed by the TCEQ with community feedback, provide the road map for improving water quality. The commission has adopted the TMDLs and approved the I-Plan.
North Bosque River: A Community Project to Protect General Uses A project to improve water quality by developing and implementing TMDLs. The TMDLs are adopted and the I-Plan is approved; together, they provide the road map to improved water quality.
Nueces Bay: A TMDL Project for Zinc A project to protect the safety of oyster consumption by people by reducing zinc in oyster harvesting waters. The adopted total maxim daily load (TMDL) and approved implementation plan (I-Plan) together are the road map for improving water quality.
Petronila Creek: Implementing a Plan to Improve Water Quality A community project to implement total maximum daily loads (TMDLs) that reduce salinity from chloride, sulfate, and dissolved solids in Petronila Creek. Together, the adopted TMDLs and the approved Implementation Plan (I-Plan) provide the road map to improved water quality.
Salado Creek: A TMDL Project for Dissolved Oxygen A completed project to improve water quality by increasing dissolved oxygen in Salado Creek. The total maximum daily load (TMDL) is adopted. Although no Implementation Plan (I-Plan) was developed and approved, stakeholders in the watershed are engaged in activities to improve dissolved oxygen levels and general water quality in the creek.