1
BGlendale Lake
Pope County, Wisconsin · 14.7 mi from Mermet Lake
- +Two grade letters higher (D → B)
- ++3.2 ft water clarity
- +Lower phosphorus (16 vs 72 µg/L)
Cleaner Lakes Than Mermet Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Mermet Lake carries a Grade D (Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Glendale Lake (Pope County, Grade B, 14.7 mi away) is the closest meaningful upgrade.
2
BOne Horse Gap Lake
Pope County, Wisconsin · 28.2 mi from Mermet Lake
- +Two grade letters higher (D → B)
- ++2.4 ft water clarity
- +Lower phosphorus (17 vs 72 µg/L)
3
CVienna Correctional Center Lake
Johnson County, Wisconsin · 11.5 mi from Mermet Lake
- +Higher grade (D → C)
- ++2.9 ft water clarity
- +Lower phosphorus (20 vs 72 µg/L)
4
CLake of Egypt
Williamson County, Wisconsin · 24.1 mi from Mermet Lake
- +Higher grade (D → C)
- ++1.6 ft water clarity
- +Lower phosphorus (26 vs 72 µg/L)
5
DDutchman Lake
Johnson County, Wisconsin · 16.8 mi from Mermet Lake
- +Higher overall water quality score
- +Lower phosphorus (37.5 vs 72 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.