Cleanest Lakes in Jefferson County, Wisconsin
Rock Lake in Jefferson County leads the rankings with a water quality grade of A and 12 ft of clarity. Below are the top 7 cleanest monitored lakes in Jefferson County, Wisconsin, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Rock Lake | Jefferson | A | 12 ft | 17.9 µg/L | - |
| 2 | Lake Ripley | Jefferson | B | 9 ft | 22.3 µg/L | - |
| 3 | Red Cedar Lake | Jefferson | C | 4.3 ft | 23.4 µg/L | - |
| 4 | Blue Spring Lake | Jefferson | C | 6.2 ft | 24 µg/L | - |
| 5 | Lower Spring Lake | Jefferson | C | 4.5 ft | 46.9 µg/L | - |
| 6 | Mud Lake | Jefferson | D | 2.3 ft | 63.1 µg/L | - |
| 7 | Lake Koshkonong | Jefferson | F | 1.7 ft | 287 µg/L | - |