1
ADeep Hole Lake
Oneida County, Wisconsin · 1.6 mi from Lake Thompson
- +Higher grade (B → A)
- ++32.8 ft water clarity
- +Lower phosphorus (10.6 vs 22.4 µg/L)
Cleaner Lakes Than Lake Thompson
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lake Thompson carries a Grade B (Good) water quality score. Within 30 miles, 2 lakes hold a higher grade. Deep Hole Lake (Oneida County, Grade A, 1.6 mi away) is the closest meaningful upgrade.
2
AGeorge Lake
Oneida County, Wisconsin · 1.5 mi from Lake Thompson
- +Higher grade (B → A)
- ++3.3 ft water clarity
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.