States are required to develop total maximum daily load (TMDL) pollutant levels for waterways that are not adequately meeting federal Clean Water Act water quality standards. 

Evaluating TMDL Projects

Our team evaluates TMDL projects based upon the calculation of the total allowable pollutant load for a surface water area in order for it to meet the state's water quality standards (this is also referred to as the "assimilative capacity" of the water body), taking into consideration the load from both point sources and nonpoint sources of pollution while incorporating a margin of safety.

We use these allocations to evaluate point source permits and to determine critical areas for implementation of best management practices for nonpoint sources. 

Stakeholder Participation

We value and seek out participation from stakeholders throughout the watershed to help restore the surface water so that it meets water quality standards and fully-supports its designated uses. 

To achieve this, local stakeholders are asked to participate throughout the project so that assumptions, calculations, and restoration measures are reasonable and accurate. Public involvement and outreach are critical components for a TMDL project's success.

Additional Resources

Visit the US Environmental Protection Agency's website for additional information on impaired surface waters and TMDLs. 

To find out which watershed you live in, click here