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Impaired Waters and Total Maximum Daily Loads (TMDL)
The federal Clean Water Act requires states to adopt water quality standards to protect lakes, streams, and wetlands from pollution. The standards define how much of a pollutant (bacteria, nutrients, turbidity, mercury, etc.) can be in the water and still meet designated uses, such as drinking water, fishing, and swimming. A water body is “impaired” if it fails to meet certain water quality standards. Once a water body is determined and listed as impaired, federal and state regulations and programs require implementation of studies that prescribe restoration measures to meet TMDL for the impaired water body. Please see the following Minnesota Pollution Control Agency (MPCA) links for further information and details.

Minnesota's Impaired Waters and TMDLs

Upper Mississippi River Bacteria TMDL

Shingle Creek Chloride TMDL

Twin and Ryan Lake Nutrient TMDL

Shingle and Bass Creek Impaired Biota and Dissolved Oxygen TMDL