Cleanest Lakes in Massac County, Illinois
Mermet Lake in Massac County leads the rankings with a water quality grade of D and 1.6 ft of clarity. Below are the top 1 cleanest monitored lakes in Massac County, Illinois, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Mermet Lake | Massac | D | 1.6 ft | 72 µg/L | - |