1
AGeneva Lake
Walworth County, Wisconsin · 4.8 mi from Delavan Lake
- +Higher grade (B → A)
- ++11.4 ft water clarity
- +Lower phosphorus (13.4 vs 26.5 µg/L)
Cleaner Lakes Than Delavan Lake
3 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.
Delavan Lake carries a Grade B (Good) water quality score. Within 30 miles, 3 lakes hold a higher grade. Geneva Lake (Walworth County, Grade A, 4.8 mi away) is the closest meaningful upgrade.
2
AGeneva Lake
Walworth County, Wisconsin · 4.9 mi from Delavan Lake
- +Higher grade (B → A)
- ++9.7 ft water clarity
- +Lower phosphorus (13 vs 26.5 µg/L)
3
BDelavan Lake
Walworth County, Wisconsin · 1.3 mi from Delavan Lake
- +Higher overall water quality score
- ++15.5 ft water clarity
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.