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DNR’s Impaired Lake List
The 1972 Clean Water Act requires states every two years to assess whether their waters meet the national goals of supporting healthy aquatic communities, habitat for wildlife, and opportunities for fishing and swimming. States are required to publish a water quality report and develop an “Impaired Waters List” of lakes and rivers that do not meet the state water quality standards.

The “Impaired Waters List” includes both lakes and rivers and water bodies that make the list must submit plans for maintaining and improving water quality in the watershed. The DNR develops models that set pollution reduction goals, identify sources of pollutants, and recommend best management practices. When monitoring shows the water-body is again meeting water quality standards it is then removed from the list.

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Lethal Doses of Liquid Potash Will Be Used To Combat Zebra Mussels - Once the winter ice recedes on Lake Winnipeg, a silk curtain will be lowered to the lake floor to seal off four infested harbors. Liquid potash will then be pumped into the water until it reaches a lethal concentration for the zebra mussels and clogs their gills.


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