1
AGeneva Lake
Walworth County, Wisconsin · 4.6 mi from Delavan Lake
- +Two grade letters higher (C → A)
- ++9 ft water clarity
- +Lower phosphorus (13 vs 73 µg/L)
Cleaner Lakes Than Delavan Lake
5 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Delavan Lake carries a Grade C (Fair) water quality score. Within 30 miles, 5 lakes hold a higher grade. Geneva Lake (Walworth County, Grade A, 4.6 mi away) is the closest meaningful upgrade.
2
AGeneva Lake
Walworth County, Wisconsin · 4.6 mi from Delavan Lake
- +Two grade letters higher (C → A)
- ++10.7 ft water clarity
- +Lower phosphorus (13.4 vs 73 µg/L)
3
AGeneva Lake Site B
Walworth County, Wisconsin · 8.2 mi from Delavan Lake
- +Two grade letters higher (C → A)
- ++14.1 ft water clarity
- +Lower phosphorus (12.9 vs 73 µg/L)
4
BDelavan Lake
Walworth County, Wisconsin · 0.4 mi from Delavan Lake
- +Higher grade (C → B)
- ++14.8 ft water clarity
- +Lower phosphorus (49.5 vs 73 µg/L)
5
BDelavan Lake
Walworth County, Wisconsin · 1.2 mi from Delavan Lake
- +Higher grade (C → B)
- +Lower phosphorus (27 vs 73 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.