1
AOasis Ranch Upper Lake
Audrain County, Wisconsin · 5.8 mi from Teal Lake
- +Two grade letters higher (F → A)
- ++12.4 ft water clarity
- +Lower phosphorus (12 vs 109 µg/L)
Cleaner Lakes Than Teal Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Teal Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 5 lakes hold a higher grade. Oasis Ranch Upper Lake (Audrain County, Grade A, 5.8 mi away) is the closest meaningful upgrade.
2
AOasis Ranch Lake
Audrain County, Wisconsin · 5.9 mi from Teal Lake
- +Two grade letters higher (F → A)
- ++12.1 ft water clarity
- +Lower phosphorus (8 vs 109 µg/L)
3
CCrow Pond
Callaway County, Wisconsin · 19.4 mi from Teal Lake
- +Two grade letters higher (F → C)
- ++2.1 ft water clarity
- +Lower phosphorus (36.6 vs 109 µg/L)
4
DTri City Lake
Boone County, Wisconsin · 18.1 mi from Teal Lake
- +Higher grade (F → D)
- +Lower phosphorus (76 vs 109 µg/L)
5
FMark Twain Lake
Monroe County, Wisconsin · 20.8 mi from Teal Lake
- +Higher overall water quality score
- +Lower phosphorus (80 vs 109 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.