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Total Maximum Daily Load Program: Communities Working Together to Improve Water Quality

A program that brings communities together to take care of Texas by improving the quality of their streams, lakes, and bays.
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The TMDL Program works to reduce pollution in impaired or threatened waterways in Texas. A TMDL is like a budget—determining how much of a particular pollutant a water body can assimilate without its quality being impaired.

While a TMDL analysis is being completed, community stakeholders begin developing an implementation plan (I-Plan) with the steps necessary to improve water quality.


About TMDLs, I-Plans, and water quality


Stakeholder Meetings

Projects of the TMDL Program

Protecting people and aquatic species by reducing pollution in impaired or threatened waterways.

TMDLs and Their Implementation

What TMDLs are and how TCEQ and stakeholders make a difference in the quality of our waterways

Participating in TMDL Projects

How to get involved in your watershed

Receive notices about TMDLs and I-Plans being developed, training, grant opportunities, and requests for proposals

Developing TMDL Projects

Guidelines for organizations that develop or implement TMDLs for Texas waterways


All Impaired Waters Adobe Acrobat PDF Document
Categories 4 and 5 of the Texas Integrated Report of Surface Water Quality
Segments with TMDLs
The TCEQ must consider TMDLs that have been adopted by the commission and approved by the EPA in permits it issues under the Texas Pollutant Discharge Elimination System (TPDES).
Preserving and Improving Water Quality

An overview of how the TCEQ defines, measures, evaluates, and manages the quality of surface waters in Texas

The Atlas of Texas Surface Waters and GIS data for classified segments and other hydrology layers

For More Information

Call 512-239-6682, or send us an e-mail at

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