Cleanest Lakes in Williamson County, Illinois
Marion Country Club Lake in Williamson County leads the rankings on measured clarity and nutrients. Below are the top 12 cleanest monitored lakes in Williamson County, Illinois, ranked on EPA nutrient and algae measurements.
Ranked List
| # | Lake | County | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|
| 1 | Marion Country Club Lake | Williamson | - | - | - |
| 2 | Marion Reservoir | Williamson | - | - | - |
| 3 | Herrin Lake | Williamson | - | - | - |
| 4 | Teal Lake | Williamson | - | - | - |
| 5 | Devils Kitchen Lake | Williamson | - | - | - |
| 6 | Little Grassy Lake | Williamson | - | - | - |
| 7 | Madison Lake | Williamson | - | - | - |
| 8 | Crab Orchard Lake | Williamson | - | - | - |
| 9 | Herrin Reservoir | Williamson | - | - | - |
| 10 | Johnston City Lake | Williamson | - | - | - |
| 11 | Sweet Lake | Williamson | - | - | - |
| 12 | Fresh Water Lake | Williamson | - | - | - |
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