Cleanest Lakes in Cook County, Illinois
Axehead Lake in Cook County leads the rankings with a water quality grade of A and 11.9 ft of clarity. Below are the top 16 cleanest monitored lakes in Cook County, Illinois, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Axehead Lake | Cook | A | 11.9 ft | 10 µg/L | - |
| 2 | Powderhorn Lake | Cook | A | 10.1 ft | 13 µg/L | - |
| 3 | Wampum Lake | Cook | B | 6.9 ft | 16 µg/L | - |
| 4 | Flatfoot Lake | Cook | B | 6.3 ft | 10.5 µg/L | - |
| 5 | Opeka Lake | Cook | B | 3.9 ft | 15.5 µg/L | - |
| 6 | Calumet Lake | Cook | B | 4.3 ft | 10.5 µg/L | - |
| 7 | Sag Quarry East Lake | Cook | C | 5.4 ft | 30.5 µg/L | - |
| 8 | Turtlehead Lake | Cook | C | 2.8 ft | 20.5 µg/L | - |
| 9 | Sag Quarry West Lake | Cook | C | 4.2 ft | 52.5 µg/L | - |
| 10 | Arrowhead Lake | Cook | D | 2.1 ft | 31.5 µg/L | - |
| 11 | Bullfrog Lake | Cook | D | 1.4 ft | 40.5 µg/L | - |
| 12 | Horsetail Lake | Cook | D | 2.2 ft | 39 µg/L | - |
| 13 | Tampier Lake | Cook | D | 1.7 ft | 38.5 µg/L | - |
| 14 | Midlothian Lake | Cook | D | 1.2 ft | 44.5 µg/L | - |
| 15 | Saganashkee Slough Lake | Cook | F | 0.8 ft | 93.5 µg/L | - |
| 16 | Skokie Lagoons Lake | Cook | F | 1.6 ft | 155 µg/L | - |