Tennessee's Total Maximum Daily Load (TMDL) Program

Introduction

Section 303(d) of the Clean Water Act requires states to develop TMDLs for those waterbodies not attaining water quality standards. The objective of a TMDL is to allocate loads among all of the known pollutants sources throughout a watershed so that appropriate control measures can be implemented and water quality standards can be achieved.

The TMDL process quantifies the amount of a pollutant that can be assimilated in a waterbody, identifies the sources of the pollutant, and recommends regulatory or other actions to be taken to achieve compliance with applicable water quality standards based on the relationship between pollution sources and instream water quality conditions. A TMDL can be expressed as the sum of all point source loads (waste load allocations), nonpoint source loads (load allocations) and an appropriate margin of safety, and is represented by this relationship:

TMDL = Sum of Point Sources + Sum of Nonpoint Sources + Margin of Safety

More information is available on the EPA web site.

All EPA approved TMDLs can be found at the bottom of each individual watershed page.

Proposed TMDLs

Announcements of the availability of proposed TMDLs on public notice and available for review:

If you would like to receive notification when a TMDL is placed on public notice, please e-mail David.Duhl@tn.gov to be added to our e-mail distribution list.

Proposed Final TMDLs

The following is a list of proposed TMDLs that have completed public notice and have been submitted to EPA for final approval.

  • None at this time.

Vision