What does a TMDL propose?

What does a TMDL propose?

A TMDL proposes acceptable loads of a pollutant from specific point (such as municipal wastewater treatment facilities and industrial waste treatment plants) and nonpoint sources (such as direct runoff from agricultural lands, urban areas, forested lands, etc.) in the watershed. TMDLs look at impacts on water bodies from specific pollutants, consider seasonal variations, and account for background levels of pollutants (those levels occurring nature). In some cases, TMDLs are developed as Phase One TMDLs because there is not enough information or data available to make a complete decision. In other cases, there are clear indications that the stream is impaired and reductions in pollutant loads are needed.