1
BPeter Lake
Hennepin County, Minnesota · 2.5 mi from Half Moon Lake
- +Two grade letters higher (D → B)
- ++6 ft water clarity
- +Lower phosphorus (43.4 vs 115.8 µg/L)
Cleaner Lakes Than Half Moon Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Half Moon Lake carries a Grade D (Poor) water quality score. Within 30 miles, 3 lakes hold a higher grade. Peter Lake (Hennepin County, Grade B, 2.5 mi away) is the closest meaningful upgrade.
2
DIndependence Lake
Hennepin County, Minnesota · 1.1 mi from Half Moon Lake
- +Higher overall water quality score
- +Lower phosphorus (66.3 vs 115.8 µg/L)
3
DThomas Lake
Hennepin County, Minnesota · 1.5 mi from Half Moon Lake
- +Higher overall water quality score
- +Lower phosphorus (78.3 vs 115.8 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.