1
CBelle Lake
Meeker County, Minnesota · 15 mi from Preston Lake
- +Two grade letters higher (F → C)
- +Lower phosphorus (42 vs 222 µg/L)
Cleaner Lakes Than Preston Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Preston Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 3 lakes hold a higher grade. Belle Lake (Meeker County, Grade C, 15 mi away) is the closest meaningful upgrade.
2
DStahl'S Lake
McLeod County, Minnesota · 13.3 mi from Preston Lake
- +Higher grade (F → D)
- +Lower phosphorus (129 vs 222 µg/L)
3
DWillie Lake
Meeker County, Minnesota · 15.6 mi from Preston Lake
- +Higher grade (F → D)
- +Lower phosphorus (72 vs 222 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.