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Water: Water Quality Standards Academy

Basic Course: Supplemental Topics (TMDL)

Listing Impaired Waters and Developing TMDLs

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Boaters in canoe on water body.

This module covers how States/Tribes identify and prioritize impaired and/or threatened waters for the 303(d) list and develop pollutant loading analyses, commonly known as TMDLs, to help meet the State/Tribe's water quality standards.

In particular, this module discusses answers to the following:

  • What is an impaired water?
  • What is the 303(d) list?
  • How do waters get on the 303(d) list?
  • What is a TMDL?
  • How are TMDLs developed?
  • What are TMDL reporting requirements?

At the end of the module is a brief quiz intended to touch on aspects of an impaired waters listing and TMDLs development. These will be further examined in the classroom session of this module.


This module's main pages and brief quiz at the end take about 20 minutes to complete.

Disclaimer: This online course presentation and any associated links have been prepared by EPA staff for informational purposes only. Their sole purpose is to make available training online from recent Water Quality Standards Academy classroom courses. As such, this online course and any associated links are not binding on EPA or the public and have no legal effect. They do not constitute an EPA statute, regulation or other requirement and do not substitute for such authorities. In addition, the course and any associated links have not been reviewed or endorsed by EPA management. Thus, they are not intended or written as official statements of EPA's scientific views, policies, guidance, or requirements and cannot be used or cited as evidence of EPA's position on any matter.

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