Cleanest Lakes in St. Charles County, Missouri
Callaway Fork Lake in St. Charles County leads the rankings with a water quality grade of D and 3.3 ft of clarity. Below are the top 6 cleanest monitored lakes in St. Charles County, Missouri, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Callaway Fork Lake | St. Charles | D | 3.3 ft | 39.5 µg/L | 12.5 µg/L |
| 2 | L. Ste. Louise Lake | St. Charles | D | 3.2 ft | 33.5 µg/L | 17.2 µg/L |
| 3 | L. Ste. Louise Lake | St. Charles | D | 2.6 ft | 40.8 µg/L | 18.3 µg/L |
| 4 | Callaway Fork Lake | St. Charles | D | 2.1 ft | 78.5 µg/L | 18.1 µg/L |
| 5 | Lake St. Louis | St. Charles | D | 2.7 ft | 50 µg/L | 74.3 µg/L |
| 6 | Lake St. Louis by Dam | St. Charles | F | 2.3 ft | 74.8 µg/L | 32.2 µg/L |