Cleaner Lake Finder
For every Grade B–F lake across the 12 states LakeQuality covers, 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
Long Lake → Holland Lake
Dakota → Dakota · mi · Minnesota
F→A
Jonathan Lake → Brickyard Lake
Carver → Carver · mi · Minnesota
F→A
Grace Lake → Brickyard Lake
Carver → Carver · mi · Minnesota
F→A
Stowe Lake → Moon Lake
Douglas → Douglas · mi · Minnesota
F→A
Oak Lake → Union Lake
Polk → Polk · mi · Minnesota
F→A
Mink Lake → Sugar Lake
Wright → Wright · mi · Minnesota
F→A
Scott Lake → West Sylvia Lake
Wright → Wright · mi · Minnesota
F→A
Cameron Lake → Union Lake
Polk → Polk · mi · Minnesota
F→A
Mcknight Lake → Brickyard Lake
Carver → Carver · mi · Minnesota
F→A
Quigley Lake → Holland Lake
Dakota → Dakota · mi · Minnesota
F→A
Millstone Lake → Sugar Lake
Wright → Wright · mi · Minnesota
F→A
Little Mary Lake → Ember Lake
Wright → Wright · mi · Minnesota
F→A
Wilhelm Lake → Charlotte Lake
Wright → Wright · mi · Minnesota
F→A
Gaystock Lake → Brickyard Lake
Carver → Carver · mi · Minnesota
F→A
Farquar Lake → Holland Lake
Dakota → Dakota · mi · Minnesota
F→A
Lake Redstone → Dutch Hollow Lake
Sauk → Sauk · mi · Wisconsin
F→A
Eagle Lake → Paddock Lake
Racine → Kenosha · mi · Wisconsin
F→A
Mason Lake → Parker Lake
Adams → Adams · mi · Wisconsin
F→A
Buffalo Lake → White Lake
Marquette → Marquette · mi · Wisconsin
F→A
Eddy by Pony Creek Lake → Mission Lake
Shawano → Shawano · mi · Wisconsin
F→A
Tilleda Off Bridge Lake → Mission Lake
Shawano → Shawano · mi · Wisconsin
F→A
Little Lake Butte des Morts → Oneida Lake
Winnebago → Outagamie · mi · Wisconsin
F→A
Crystal Lake Max Depth → Blue Pit Lake
Hancock → Cerro Gordo · 29.5 mi · Iowa
F→A
Silver Lake Max Depth → West Okoboji Lake
Dickinson → Dickinson · 9.8 mi · Iowa
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.