1
ACharlotte Lake
Wright County, Minnesota · 3.1 mi from Wilhelm Lake
- +Two grade letters higher (F → A)
- ++15.1 ft water clarity
- +Lower phosphorus (12.5 vs 131 µg/L)
Cleaner Lakes Than Wilhelm Lake
4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Wilhelm Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 4 lakes hold a higher grade. Charlotte Lake (Wright County, Grade A, 3.1 mi away) is the closest meaningful upgrade.
2
CBeebe Lake
Wright County, Minnesota · 2.3 mi from Wilhelm Lake
- +Two grade letters higher (F → C)
- ++2.6 ft water clarity
- +Lower phosphorus (35.5 vs 131 µg/L)
3
DSchwappauf Lake
Hennepin County, Minnesota · 4.1 mi from Wilhelm Lake
- +Higher grade (F → D)
- ++2.4 ft water clarity
- +Lower phosphorus (65.1 vs 131 µg/L)
4
DMartha Lake
Wright County, Minnesota · 3.2 mi from Wilhelm Lake
- +Higher grade (F → D)
- +Lower phosphorus (75 vs 131 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.