1
DLake 36
St. Charles County, Wisconsin · 12.8 mi from Mallard Lake
- +Higher grade (F → D)
- +Lower phosphorus (31 vs 84 µg/L)
Cleaner Lakes Than Mallard Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Mallard Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Lake 36 (St. Charles County, Grade D, 12.8 mi away) is the closest meaningful upgrade.
2
DSimpson Park Lake
St. Louis County, Wisconsin · 10.1 mi from Mallard Lake
- +Higher grade (F → D)
- +Lower phosphorus (73 vs 84 µg/L)
3
DSimpson Park Lake
St. Louis County, Wisconsin · 10.1 mi from Mallard Lake
- +Higher grade (F → D)
- +Lower phosphorus (36 vs 84 µg/L)
4
DForest Park Pond
St. Louis city County, Wisconsin · 12.1 mi from Mallard Lake
- +Higher grade (F → D)
- +Lower phosphorus (68.8 vs 84 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.