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Minnesota Wisconsin Map Methodology Search

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3,770 lakes across Minnesota and Wisconsin. Click any lake to see its water quality grade.

A — Excellent B — Good C — Fair D — Poor F — Very Poor

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LakeGrade

Water quality report cards for every monitored lake in Minnesota and Wisconsin. Grades based on EPA Water Quality Portal data using Metropolitan Council standards.

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Data sourced from the EPA Water Quality Portal. Grading based on Metropolitan Council standards. Not affiliated with any government agency.