What is a TMDL?
A TMDL (Total Maximum Daily Load) is a written, quantitative assessment of water quality problems and contributing pollutant sources. It specifies the amount of pollution reduction necessary to meet water quality standards, allocates the necessary pollutant limits among the various sources in the watershed and provides a basis for taking actions needed to restore a waterbody. TMDLs range from ten to over 100 pages in length, depending on the complexity of the issues. The goal of a TMDL is to attain state water quality standards. A TMDL is a technical and legal document which must include: • a description of applicable water quality standards • an identification of existing sources • a technical assessment • the loading capacity • load allocations and waste load allocations • a margin of safety • an analysis of water quality standards attainment • public participation & documentation The EPA has the responsibility to approve or disapprove TMDLs. …
