1
CKent Park Lake
Johnson County, Wisconsin · 22 mi from Hannen Lake
- +Two grade letters higher (F → C)
- ++3.6 ft water clarity
Cleaner Lakes Than Hannen Lake
1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.
Hannen Lake carries a Grade F (Very Poor) water quality score. Within 30 miles, 1 lake holds a higher grade. Kent Park Lake (Johnson County, Grade C, 22 mi away) is the closest meaningful upgrade.
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.