An official website of the United States government.

Impaired Waters and TMDLs

TMDL Support Documents

EPA support for developing and reviewing Total Maximum Daily Loads (TMDLs) dates back to 1991 and remains relatively unchanged. More recently, EPA has focused on various aspects of TMDLs and the TMDL process, such as watershed-scale TMDLs, multijurisdictional TMDLs and TMDLs for specific pollutants. Below is a list of programmatic and topic-specific TMDL resources.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Section 303(d) Program Implementation Documents

TMDL Development for Specific Topics

TMDL Examples

Bacteria, Dissolved Oxygen and Metals

Bacteria and Nutrients

Bacteria, Nutrients and Temperature

Bacteria and Aluminum

Mercury

Nutrients, Turbidity and Dissolved Oxygen

Related Links