1
ASofie Lake
Carlton County, Minnesota · 1.2 mi from Perch Lake
- +Two grade letters higher (C → A)
- ++10.5 ft water clarity
Cleaner Lakes Than Perch Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Perch Lake carries a Grade C (Fair) water quality score. Within 30 miles, 3 lakes hold a higher grade. Sofie Lake (Carlton County, Grade A, 1.2 mi away) is the closest meaningful upgrade.
2
ABig Lake
Carlton County, Minnesota · 2 mi from Perch Lake
- +Two grade letters higher (C → A)
- ++6.9 ft water clarity
- +Lower phosphorus (12 vs 25 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.