Eastern Michigan University

Environmental Health & Safety

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Middle Huron Stormwater Plan For Addressing

Total Maximum Daily Loads


A TMDL is an estimate of how much of a pollutant, or group of pollutants, a water body (lake, pond, river, stream, or estuary) can absorb without becoming polluted. In this situation, being polluted means a water body is not meeting the water quality standards that have been assigned to it by the state. TMDLs are developed for a pollutant (or a group of pollutants) in water bodies that are listed in each state's list of impaired waters, known as the 303(d) list. Developing TMDLs is an important step in solving water-quality problems.



A TMDL provides…

  • Analysis and estimates of pollutant loadings from all significant point and non-point sources.
  • A link between pollutants sources and their impacts on water quality.
  • An allocation of allowable pollutant loads among sources.
  • Identification of control actions for achieving water quality standards.
  • An opportunity for public participation.



Middle Huron TMDL Plan

Middle Huron TMDL Plan (Appendices)

Michigan’s 303(d) List