Cleanest Lakes in Polk County, Minnesota
Union Lake in Polk County leads the rankings with a water quality grade of A and 15 ft of clarity. Below are the top 21 cleanest monitored lakes in Polk County, Minnesota, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Union Lake | Polk | A | 15 ft | 14 µg/L | - |
| 2 | Perch Lake | Polk | A | 10.3 ft | 19 µg/L | - |
| 3 | Cable Lake | Polk | A | 10.2 ft | 19 µg/L | - |
| 4 | Sand Hill Lake | Polk | B | 6.9 ft | 26 µg/L | - |
| 5 | Poplar Lake | Polk | B | 8.9 ft | 23 µg/L | - |
| 6 | Sarah Lake | Polk | B | 7.7 ft | 29.5 µg/L | - |
| 7 | Kittleson Lake | Polk | B | 7.1 ft | 26 µg/L | - |
| 8 | Badger Lake | Polk | C | 6.6 ft | 27 µg/L | - |
| 9 | Spring Lake | Polk | C | 5.6 ft | 20 µg/L | - |
| 10 | Whitefish Lake | Polk | C | 3.9 ft | 44 µg/L | - |
| 11 | Uff Lake | Polk | C | 3.9 ft | 35 µg/L | - |
| 12 | Unnamed Lake | Polk | D | 6.9 ft | 95 µg/L | - |
| 13 | Maple Lake | Polk | D | 3.3 ft | 38.5 µg/L | - |
| 14 | Turtle Lake | Polk | D | 3 ft | 58.5 µg/L | - |
| 15 | Cross Lake | Polk | D | 3 ft | 49.5 µg/L | - |
| 16 | Hill River Lake | Polk | D | 4.1 ft | 73 µg/L | - |
| 17 | Store Lake | Polk | D | 6.9 ft | 193 µg/L | - |
| 18 | Halverson Lake | Polk | D | 3 ft | 51 µg/L | - |
| 19 | Unnamed Lake | Polk | D | 2 ft | 72 µg/L | - |
| 20 | Oak Lake | Polk | F | 3 ft | 113 µg/L | - |
| 21 | Cameron Lake | Polk | F | 1 ft | 130 µg/L | - |