Cleanest Lakes in St. Louis County, Missouri
Simpson Park Lake in St. Louis County leads the rankings with a water quality grade of D and 1.9 ft of clarity. Below are the top 4 cleanest monitored lakes in St. Louis County, Missouri, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Simpson Park Lake | St. Louis | D | 1.9 ft | 72.3 µg/L | 23.8 µg/L |
| 2 | Mallard Lake | St. Louis | F | 1.9 ft | 84 µg/L | 32.2 µg/L |
| 3 | Creve Coeur Lake | St. Louis | F | 1.6 ft | 101 µg/L | 35.4 µg/L |
| 4 | Spanish Lake | St. Louis | F | 1.6 ft | 347.8 µg/L | 62.6 µg/L |
More Answers for St. Louis County, Missouri
Get St. Louis County, Missouri water-quality updates
New grades and algae readings can change this ranking. Unsubscribe anytime.