1
AJordan Lake
Adams County, Wisconsin · 6.4 mi from Mason Lake
- +Two grade letters higher (D → A)
- ++42 ft water clarity
- +Lower phosphorus (12.1 vs 104.5 µg/L)
Cleaner Lakes Than Mason Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Mason Lake carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Jordan Lake (Adams County, Grade A, 6.4 mi away) is the closest meaningful upgrade.
2
ACrooked Lake
Adams County, Wisconsin · 7.9 mi from Mason Lake
- +Two grade letters higher (D → A)
- ++25.6 ft water clarity
- +Lower phosphorus (16.7 vs 104.5 µg/L)
3
AParker Lake
Adams County, Wisconsin · 8.4 mi from Mason Lake
- +Two grade letters higher (D → A)
- ++51.9 ft water clarity
- +Lower phosphorus (14.8 vs 104.5 µg/L)
4
ADeep Lake
Adams County, Wisconsin · 9 mi from Mason Lake
- +Two grade letters higher (D → A)
- ++47 ft water clarity
- +Lower phosphorus (13.3 vs 104.5 µg/L)
5
APeppermill Lake
Adams County, Wisconsin · 9.3 mi from Mason Lake
- +Two grade letters higher (D → A)
- ++22.3 ft water clarity
- +Lower phosphorus (27 vs 104.5 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.