Cleanest Lakes in St. Clair County, Illinois
Slm Side Channel Lake in St. Clair County leads the rankings with a water quality grade of F and 0.8 ft of clarity. Below are the top 1 cleanest monitored lakes in St. Clair County, Illinois, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Slm Side Channel Lake | St. Clair | F | 0.8 ft | 275.5 µg/L | - |