Cleanest Lakes in Williamson County, Illinois
Marion Country Club Lake in Williamson County leads the rankings with a water quality grade of NR. Below are the top 12 cleanest monitored lakes in Williamson County, Illinois, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Marion Country Club Lake | Williamson | NR | - | - | - |
| 2 | Marion Reservoir | Williamson | NR | - | - | - |
| 3 | Herrin Lake | Williamson | NR | - | - | - |
| 4 | Teal Lake | Williamson | NR | - | - | - |
| 5 | Devils Kitchen Lake | Williamson | NR | - | - | - |
| 6 | Little Grassy Lake | Williamson | NR | - | - | - |
| 7 | Madison Lake | Williamson | NR | - | - | - |
| 8 | Crab Orchard Lake | Williamson | NR | - | - | - |
| 9 | Herrin Reservoir | Williamson | NR | - | - | - |
| 10 | Johnston City Lake | Williamson | NR | - | - | - |
| 11 | Sweet Lake | Williamson | NR | - | - | - |
| 12 | Fresh Water Lake | Williamson | NR | - | - | - |
More Answers for Williamson County, Illinois
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