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Water: Water Quality Standards Academy

Basic Course: Supplemental Topics - TMDL Development: Documentation and Review

Listing Impaired Waters and Developing TMDLs

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The TMDL document must include components required by statute or regulation. EPA guidance recommends additional components.

Elements of a Typical TMDL Document

Regulations

(40 CFR Part 130)

EPA
Guidance

Identification of water body, pollutant of concern, pollutant sources, and priority ranking.

 

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Applicable water quality standards.
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Loading capacity.
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Load allocations and waste load allocations.
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Margin of safety.
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Consideration of seasonal variation.
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Reasonable assurance for point source/nonpoint sources.

 

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Monitoring plan to track TMDL effectiveness.

 

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Implementation plan.

 

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Public participation.

 

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Resource. See also EPA's guidelines for reviewing TMDLs.


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Key Point. Under the CWA, States/Tribes are primarily responsible for developing TMDLs. EPA is required to review and approve or disapprove TMDLs developed and submitted by States/Tribes within 30 days. If EPA disapproves a State/Tribe's TMDL, EPA must establish such TMDL within 30 days.

Disclaimer:
For informational purposes only–Not official statements of EPA policy.

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