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Segments with Total Maximum Daily Loads

A list of water-quality segments, in numerical order, for which the commission has adopted TMDLs. Segments numbers are assigned to surface waterways, or portions of waterways, to provide a geographic unit for managing water quality.

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List of Segments with TMDLs

(In numerical order by segment number)

The TCEQ must consider all TMDLs that have been adopted by the commission and approved by the U.S. EPA in all permits it issues under the Texas Pollutant Discharge Elimination System (TPDES). The TCEQ must also consider all impaired waters Adobe Acrobat PDF Document when developing and issuing a permit to discharge to waters of the state.

Learn more about impaired waters and the status of surface water quality in the state's Integrated Report of Surface Water Quality.

Segment NumberParametersProject Name
403 Dissolved Oxygen Lake O’ the Pines
0508 Bacteria, Dissolved Oxygen Orange County Watersheds
0508A Dissolved Oxygen, Bacteria Orange County Watersheds
0508B Dissolved Oxygen, Bacteria Orange County Watersheds
0508C Dissolved Oxygen, Bacteria Orange County Watersheds
0511 Bacteria, Dissolved Oxygen, pH Orange County Watersheds
0511A Dissolved Oxygen Orange County Watersheds
0511B Dissolved Oxygen, Bacteria Orange County Watersheds
0511C Dissolved Oxygen, Bacteria Orange County Watersheds
0511E Bacteria Orange County Watersheds
0805 Chlordane in fish tissue
Bacteria
Dallas & Tarrant County Legacy Pollutants
&
Greater Trinity Region
0806 Chlordane in fish tissue Fort Worth Legacy Pollutants
0806A Chlordane, DDE, Dieldrin, and PCBs in fish tissue Fort Worth Legacy Pollutants
0806B PCBs in fish tissue Fort Worth Legacy Pollutants
0807 PCBs in fish tissue Lake Worth
0822A Bacteria Greater Trinity Region
0822B Bacteria Greater Trinity Region
0829 Chlordane in fish tissue Fort Worth Legacy Pollutants
0829A Chlordane, DDE, Dieldrin, and PCBs in fish tissue Fort Worth Legacy Pollutants
0841

Chlordane in fish tissue
Bacteria

Dallas & Tarrant County Legacy Pollutants
&
Greater Trinity Region
0841A Chlordane, Dieldrin, DDE, DDT, Heptachlor Epoxide, and PCBs in fish tissue Dallas & Tarrant County Legacy Pollutants
 0841B Bacteria Greater Trinity Region 
0841C Bacteria  Greater Trinity Region
0841E Bacteria Greater Trinity Region  
0841G Bacteria  Greater Trinity Region
0841H Bacteria Greater Trinity Region  
0841J Bacteria  Greater Trinity Region
 0841L Bacteria  Greater Trinity Region
 0841M Bacteria  Greater Trinity Region
0841R Bacteria  Greater Trinity Region
 0841T Bacteria  Greater Trinity Region
0841U Bacteria  Greater Trinity Region
1001 Nickel Houston Ship Channel
1004E Bacteria Houston-Galveston Region
1005 Nickel Houston Ship Channel
1006 Nickel Houston Ship Channel
1006D Bacteria Houston-Galveston Region
1006F Bacteria Houston-Galveston Region
1006H Bacteria Houston-Galveston Region
1006I Bacteria Houston-Galveston Region
1006J Bacteria Houston-Galveston Region
1007 Nickel Houston Ship Channel
1007A Bacteria Houston-Galveston Region 
1007B Bacteria Houston-Galveston Region
1007C Bacteria Houston-Galveston Region
1007D Bacteria Houston-Galveston Region
1007E Bacteria Houston-Galveston Region
1007F Bacteria Houston-Galveston Region
1007G Bacteria Houston-Galveston Region
1007H Bacteria Houston-Galveston Region
1007I Bacteria Houston-Galveston Region
1007K Bacteria Houston-Galveston Region
1007L Bacteria Houston-Galveston Region
1007M Bacteria Houston-Galveston Region
1007N Bacteria Houston-Galveston Region
1007O Bacteria Houston-Galveston Region
1007R Bacteria Houston-Galveston Region
1007S Bacteria Houston-Galveston Region 
1007T Bacteria Houston-Galveston Region 
1007U Bacteria Houston-Galveston Region 
1007V Bacteria Houston-Galveston Region 
1008 Bacteria Houston-Galveston Region
1008H Bacteria Houston-Galveston Region
1009 Bacteria Houston-Galveston Region
1009C Bacteria Houston-Galveston Region
1009D Bacteria Houston-Galveston Region
1009E Bacteria Houston-Galveston Region
1010 Bacteria Houston-Galveston Region
1011 Bacteria Houston-Galveston Region
1013

Nickel
Bacteria

Houston Ship Channel
&
Houston-Galveston Region
1013A Bacteria Houston-Galveston Region
1013C Bacteria Houston-Galveston Region
1014 Nickel
Bacteria
Houston Ship Channel: Nickel
 &
Houston-Galveston Region: Bacteria
1014A Bacteria Houston-Galveston Region
1014B Bacteria Houston-Galveston Region
1014E Bacteria Houston-Galveston Region
1014H Bacteria Houston-Galveston Region
1014K Bacteria Houston-Galveston Region
1014L Bacteria Houston-Galveston Region
1014M Bacteria Houston-Galveston Region
1014N Bacteria Houston-Galveston Region
1014O Bacteria Houston-Galveston Region
1016 Nickel
Bacteria
Houston Ship Channel: Nickel
&
Houston-Galveston Region: Bacteria
1016A Bacteria Houston-Galveston Region
1016B Bacteria Houston-Galveston Region
1016C Bacteria Houston-Galveston Region
1016D Bacteria Houston-Galveston Region
1017 Nickel
Bacteria
Houston Ship Channel: Nickel
&
Houston-Galveston Region: Bacteria
1017A Bacteria Houston-Galveston Region
1017B Bacteria Houston-Galveston Region
1017C Bacteria Houston-Galveston Region 
1017D Bacteria Houston-Galveston Region
1017E Bacteria Houston-Galveston Region
Segment NumberParametersProject Name
1101 Bacteria
Chlordane in fish tissue
Dichloroethane in fish tissue &
Trichloroethane in fish and crab issue
Houston-Galveston Region: Bacteria
&
Clear Creek: Chlordane
&
Clear Creek: VOCs
1101A Bacteria Houston-Galveston Region
1101B Bacteria Houston-Galveston Region
1101C Bacteria Houston-Galveston Region
1101D Bacteria Houston-Galveston Region
1101E Bacteria Houston-Galveston Region
1101G Bacteria Houston-Galveston Region 
1102 Bacteria
Chloride
Total Dissolved Solids
Chlordane in fish tissue
Dichloroethane in fish tissue &
Trichloroethane in fish and crab issue
Houston-Galveston Region: Bacteria

Clear Creek: Chlordane

Clear Creek: VOCs
 &
Clear Creek Above Tidal: TDS and Chloride
1102A Bacteria Houston-Galveston Region
1102B Bacteria Houston-Galveston Region
1102C Bacteria Houston-Galveston Region
1102D Bacteria Houston-Galveston Region
1102E Bacteria Houston-Galveston Region
1102G Bacteria Houston-Galveston Region
1103 Bacteria Dickinson Bayou and Tidal Tributaries
1103A Bacteria Dickinson Bayou and Tidal Tributaries
1103B Bacteria Dickinson Bayou and Tidal Tributaries
1103C Bacteria Dickinson Bayou and Tidal Tributaries
1103D Bacteria Dickinson Bayou and Tidal Tributaries
1104 Bacteria Dickinson Bayou and Tidal Tributaries
1209C Bacteria Carters Creek Watershed
1209D Bacteria Carters Creek Watershed
1209L Bacteria Carters Creek Watershed
1226 Orthophosphorus North Bosque River
1245 Bacteria, Dissolved Oxygen Upper Oyster Creek
1254 Atrazine Aquilla Reservoir
1255 Orthophosphorus North Bosque River
1403 Dissolved Oxygen Lake Austin
1411 Sulfate, Total Dissolved Solids E.V. Spence Reservoir
1426 Chloride, Total Dissolved Solids Colorado River Below E.V. Spence
1428C Bacteria Gilleland Creek
1806 Bacteria Guadalupe River Above Canyon Lake
1901 Bacteria Lower San Antonio River
1910 Bacteria, Dissolved Oxygen Upper San Antonio River: Bacteria
&
Salado Creek: Dissolved Oxygen
1910A Bacteria Upper San Antonio River
1911 Bacteria Upper San Antonio River
2110 Nitrite + Nitrate Nitrogen Lower Sabinal River
2202 Chlordane, DDD, DDE, DDT, Dieldrin, Endrin, Heptachlor, Heptachlor Epoxide, Hexachlorobenzene, and Lindane in fish tissue Arroyo Colorado
2202A PCBs in fish tissue Arroyo Colorado
2204 Chloride, Dissolved Solids, and Sulfate Petronila Creek
2421 Bacteria in Oyster Waters Upper Texas Coast
2422 Bacteria in Oyster Waters  Upper Texas Coast
2423 Bacteria in Oyster Waters  Upper Texas Coast
2424 Bacteria in Oyster Waters  Upper Texas Coast
2426 Nickel Houston Ship Channel
2427 Nickel Houston Ship Channel
2428 Nickel Houston Ship Channel
2429 Nickel Houston Ship Channel
2430 Nickel Houston Ship Channel
2432 Bacteria in Oyster Waters Upper Texas Coast
2433OW Bacteria in Oyster Waters Upper Texas Coast
2434OW Bacteria in Oyster Waters Upper Texas Coast
2435OW Bacteria in Oyster Waters Upper Texas Coast
2436 Nickel Houston Ship Channel
2439 Bacteria in Oyster Waters Upper Texas Coast
2482 Zinc in Oysters Nueces Bay
2485 Bacteria Oso Bay

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What Segments Are

Texas has more than 11,000 named water bodies. The TCEQ has divided most of the perennial (always flowing) streams and the lakes, wetlands, and estuaries that have large areas or are of major public interest, into segments. A segment is a water body, or portion of a water body.

Segments are used for several management activities, such as the designation of site-specific uses and criteria, assessment of instream water quality, issuance of permits to discharge into state waters, development of TMDLs, or allocation of grant funds.

Segments are aggregated by basin. Texas has 23 major river and coastal basins. See Hydrography Maps and Data to find the Atlas of Texas Surface Waters and hydrography data for GIS mapping.

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For More Information

Send an e-mail to tmdl@tceq.texas.gov, or call us at 512-239-6682.

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