Cleanest Lakes in Lake County, Illinois
Round Lake in Lake County leads the rankings with a water quality grade of B and 7.4 ft of clarity. Below are the top 12 cleanest monitored lakes in Lake County, Illinois, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Round Lake | Lake | B | 7.4 ft | 19.5 µg/L | - |
| 2 | Grays Lake | Lake | B | 3.5 ft | 18 µg/L | - |
| 3 | Catherine Lake | Lake | B | 7.4 ft | 27.5 µg/L | - |
| 4 | Channel Lake | Lake | C | 8 ft | 34.5 µg/L | - |
| 5 | Long Lake | Lake | D | 3.4 ft | 35 µg/L | 47.6 µg/L |
| 6 | Grass Lake | Lake | D | 1.4 ft | 57.5 µg/L | - |
| 7 | Long Lake | Lake | D | 2.9 ft | 41.5 µg/L | - |
| 8 | Fox Lake | Lake | D | 1.9 ft | 43 µg/L | - |
| 9 | Petite Lake | Lake | D | 2.5 ft | 36 µg/L | - |
| 10 | Nippersink Lake | Lake | D | 1.3 ft | 44.5 µg/L | - |
| 11 | Marie Lake | Lake | D | 2.7 ft | 69 µg/L | - |
| 12 | Bluff Lake | Lake | D | 4 ft | 315.5 µg/L | - |