1
BGreen Lake
Green Lake County, Wisconsin · 2.8 mi from Green Lake
- +Higher grade (C → B)
- +Lower phosphorus (23 vs 66.5 µg/L)
Cleaner Lakes Than Green Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Green Lake carries a Grade C (Fair) water quality score. Within 30 miles, 3 lakes hold a higher grade. Green Lake (Green Lake County, Grade B, 2.8 mi away) is the closest meaningful upgrade.
2
BGreen Lake
Green Lake County, Wisconsin · 1.8 mi from Green Lake
- +Higher grade (C → B)
- +Lower phosphorus (32 vs 66.5 µg/L)
3
BGreen Lake East Basin
Green Lake County, Wisconsin · 2.8 mi from Green Lake
- +Higher grade (C → B)
- +Lower phosphorus (43 vs 66.5 µg/L)
How this list is built
Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.