Cleaner Lake Finder
For every Grade B–F lake in Minnesota and Wisconsin, we surface up to five higher-graded alternatives within 30 miles. Same state, same region — just cleaner water. Every grade comes from real EPA samples.
Biggest cleanup swaps
Lakes where the closest higher-graded alternative offers the largest water quality improvement.
F→A
Unnamed Lake → White Bear Lake
Ramsey → Washington · 2.7 mi · Minnesota
F→A
Jonathan Lake → Brickyard Lake
Carver → Carver · 2.7 mi · Minnesota
F→A
Goose Lake → White Bear Lake
Ramsey → Washington · 1.9 mi · Minnesota
F→A
Mink Lake → Sugar Lake
Wright → Wright · 3.1 mi · Minnesota
F→A
Stowe Lake → Moon Lake
Douglas → Douglas · 3.5 mi · Minnesota
F→A
Mcknight Lake → Brickyard Lake
Carver → Carver · 3.1 mi · Minnesota
F→A
Dean Lake → Charlotte Lake
Wright → Wright · 4.7 mi · Minnesota
F→A
Winona Lake → Cowdry Lake
Douglas → Douglas · 1.9 mi · Minnesota
F→A
Millstone Lake → Sugar Lake
Wright → Wright · 2.9 mi · Minnesota
F→A
Gaystock Lake → Brickyard Lake
Carver → Carver · 3.7 mi · Minnesota
F→A
Little Mary Lake → Sugar Lake
Wright → Wright · 3.2 mi · Minnesota
F→A
Wilhelm Lake → Charlotte Lake
Wright → Wright · 3.1 mi · Minnesota
F→A
Big Eau Pleine Lake → Big Bass Lake
Marathon → Marathon · 20.1 mi · Wisconsin
F→A
Tilleda Off Bridge Lake → Sams Lake
Shawano → Shawano · 7.7 mi · Wisconsin
F→A
Typo Lake → Lower Birch Lake
Anoka → Isanti · 2.6 mi · Minnesota
F→A
Knife Lake → Ml-Thains Lake
Kanabec → Mille Lacs · 14.3 mi · Minnesota
F→A
Unn Pond → Holland Lake
Dakota → Dakota · 2.1 mi · Minnesota
F→A
Quigley Lake → Holland Lake
Dakota → Dakota · 1.2 mi · Minnesota
D→A
Long Lake → George Lake
Kandiyohi → Kandiyohi · 3.6 mi · Minnesota
D→A
Unnamed Lake → Sugar Lake
Wright → Wright · 3.5 mi · Minnesota
D→A
Grace Lake → Brickyard Lake
Carver → Carver · 2.1 mi · Minnesota
D→A
Martha Lake → Charlotte Lake
Wright → Wright · 0.7 mi · Minnesota
D→A
Scott Lake → West Sylvia Lake
Wright → Wright · 3.2 mi · Minnesota
D→A
Dart Lake → Long Lake
Becker → Becker · 2.3 mi · Minnesota
How this works
- Data: EPA Water Quality Portal samples — secchi depth, phosphorus, chlorophyll-a.
- Grading: Metropolitan Council thresholds (1980s standard). See methodology.
- Filter: within 30 miles, same state, strictly higher numeric score, sufficient monitoring data.
- Rank: by grade improvement, with a small proximity tiebreak.