Cleanest Lakes in St. Louis city County, Missouri
Boathouse Lake in St. Louis city County leads the rankings with a water quality grade of D and 2.3 ft of clarity. Below are the top 5 cleanest monitored lakes in St. Louis city County, Missouri, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Boathouse Lake | St. Louis city | D | 2.3 ft | 59.8 µg/L | 18 µg/L |
| 2 | O'Fallon Park Lake | St. Louis city | D | 1.6 ft | 335 µg/L | 2 µg/L |
| 3 | Lafayette Park Lake | St. Louis city | D | 2.3 ft | 127.5 µg/L | 18.2 µg/L |
| 4 | Forest Park Pond | St. Louis city | D | 1.6 ft | 68.8 µg/L | 23.3 µg/L |
| 5 | Jefferson Lake | St. Louis city | D | - | 70 µg/L | 55.2 µg/L |