1
ADeer Lake
Polk County, Wisconsin · 3.5 mi from Long Lake
- +Two grade letters higher (C → A)
- ++43.3 ft water clarity
- +Lower phosphorus (16.9 vs 26.1 µg/L)
Cleaner Lakes Than Long Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Long Lake carries a Grade C (Fair) water quality score. Within 30 miles, 5 lakes hold a higher grade. Deer Lake (Polk County, Grade A, 3.5 mi away) is the closest meaningful upgrade.
2
ALoveless Lake
Polk County, Wisconsin · 1.1 mi from Long Lake
- +Two grade letters higher (C → A)
- ++21.2 ft water clarity
3
ABalsam Lake
Polk County, Wisconsin · 3.8 mi from Long Lake
- +Two grade letters higher (C → A)
- ++36.8 ft water clarity
4
BLittle Bass Lake
Polk County, Wisconsin · 2 mi from Long Lake
- +Higher grade (C → B)
- ++12.1 ft water clarity
5
BHow 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.