1
BLake Mendota
Dane County, Wisconsin · 12.8 mi from Lake Kegonsa
- +Higher overall water quality score
- ++5.7 ft water clarity
- +Lower phosphorus (50.2 vs 59.5 µg/L)
Cleaner Lakes Than Lake Kegonsa
2 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Lake Kegonsa carries a Grade B (Good) water quality score. Within 30 miles, 2 lakes hold a higher grade. Lake Mendota (Dane County, Grade B, 12.8 mi away) is the closest meaningful upgrade.
2
BRed Cedar Lake
Jefferson County, Wisconsin · 12.9 mi from Lake Kegonsa
- +Higher overall water quality score
- +Lower phosphorus (23.7 vs 59.5 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.