Cleanest Lakes in Washington County, Minnesota
Square Lake in Washington County leads the rankings with a water quality grade of A and 17 ft of clarity. Below are the top 50 cleanest monitored lakes in Washington County, Minnesota, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Square Lake | Washington | A | 17 ft | 9 µg/L | 2.6 µg/L |
| 2 | Little Carnelian Lake | Washington | A | 20 ft | 9 µg/L | 2.1 µg/L |
| 3 | East Boot Lake | Washington | A | 15 ft | 16 µg/L | 2.5 µg/L |
| 4 | Twin Lake | Washington | A | 13 ft | 13 µg/L | 2.8 µg/L |
| 5 | Clear Lake | Washington | A | 14 ft | 16 µg/L | 3.4 µg/L |
| 6 | Big Carnelian Lake | Washington | A | 14.5 ft | 12 µg/L | 3.6 µg/L |
| 7 | Elmo Lake | Washington | A | 11.1 ft | 12.5 µg/L | 1.7 µg/L |
| 8 | Jane Lake | Washington | A | 13 ft | 18 µg/L | 3.8 µg/L |
| 9 | Olson Lake | Washington | A | 11.2 ft | 15 µg/L | 2.8 µg/L |
| 10 | Mays Lake | Washington | A | 11 ft | 16 µg/L | 4.5 µg/L |
| 11 | West Boot Lake | Washington | A | 14 ft | 14 µg/L | 2.5 µg/L |
| 12 | White Bear Lake | Washington | A | 14.4 ft | 15 µg/L | - |
| 13 | Big Marine Lake | Washington | B | 12 ft | 13 µg/L | 5.5 µg/L |
| 14 | Lily Lake | Washington | B | 10.5 ft | 17 µg/L | 5.4 µg/L |
| 15 | White Rock Lake | Washington | B | 7.5 ft | 19.5 µg/L | 2.2 µg/L |
| 16 | Wood Pile Lake | Washington | B | 10 ft | 20 µg/L | 4.4 µg/L |
| 17 | Sunset Lake | Washington | B | 9.5 ft | 16 µg/L | 3.7 µg/L |
| 18 | Pine Tree Lake | Washington | B | 8.5 ft | 17 µg/L | 4.2 µg/L |
| 19 | Edith Lake | Washington | B | 8.2 ft | 14 µg/L | 3.6 µg/L |
| 20 | Halfbreed Lake | Washington | B | 5.2 ft | 9.5 µg/L | 2.3 µg/L |
| 21 | Plaisted Lake | Washington | B | 7.3 ft | 25 µg/L | 3.3 µg/L |
| 22 | Master Man Lake | Washington | B | 4.5 ft | 19 µg/L | 4.7 µg/L |
| 23 | Demontreville Lake | Washington | B | 10.2 ft | 25.5 µg/L | 8.9 µg/L |
| 24 | Long Lake | Washington | B | 8 ft | 25 µg/L | 5.8 µg/L |
| 25 | Fish Lake | Washington | B | 5 ft | 26 µg/L | 4.6 µg/L |
| 26 | Sunfish Lake | Washington | B | 8.9 ft | 25 µg/L | 7.2 µg/L |
| 27 | North School Section Lake | Washington | B | 7.8 ft | 25.5 µg/L | 8.2 µg/L |
| 28 | Benz Lake | Washington | B | 4.5 ft | 26 µg/L | 3.6 µg/L |
| 29 | Lake St. Croix | Washington | B | 5.2 ft | 18 µg/L | - |
| 30 | Bass Lake | Washington | C | 6.5 ft | 26.5 µg/L | 7.6 µg/L |
| 31 | Lost Lake | Washington | C | 6.3 ft | 25 µg/L | 5.3 µg/L |
| 32 | Jellums Lake | Washington | C | 6 ft | 27 µg/L | 8.7 µg/L |
| 33 | Battle Creek Lake | Washington | C | 7.2 ft | 52 µg/L | - |
| 34 | South Twin Lake | Washington | C | 5 ft | 32 µg/L | 9.2 µg/L |
| 35 | Forest Lake | Washington | C | 5.1 ft | 28 µg/L | 17 µg/L |
| 36 | Carver Lake | Washington | C | 7.4 ft | 53 µg/L | - |
| 37 | Hay Lake | Washington | C | 3.5 ft | 30 µg/L | 5.4 µg/L |
| 38 | Bone Lake | Washington | C | 5.5 ft | 29 µg/L | 19 µg/L |
| 39 | Beutel'S Pond | Washington | C | 2.5 ft | 36.5 µg/L | 3.9 µg/L |
| 40 | Fish Lake | Washington | C | 6 ft | 42 µg/L | 12.5 µg/L |
| 41 | Friedrich Pond | Washington | C | 2.3 ft | 60.5 µg/L | 4.1 µg/L |
| 42 | O'Connors Lake | Washington | C | 6.6 ft | 32 µg/L | 14 µg/L |
| 43 | Mckusick Lake | Washington | C | 6 ft | 41 µg/L | 11 µg/L |
| 44 | Lynch Lake | Washington | C | 5.8 ft | 33 µg/L | 10 µg/L |
| 45 | Sunnybrook Lake | Washington | C | 4.5 ft | 41.5 µg/L | 19.5 µg/L |
| 46 | Cloverdale Lake | Washington | C | 5 ft | 30 µg/L | 17.5 µg/L |
| 47 | Pat Lake | Washington | C | 6.5 ft | 39 µg/L | 11 µg/L |
| 48 | Clear Lake | Washington | C | 6.2 ft | 33 µg/L | - |
| 49 | Pool of Lake St. Croix | Washington | C | 4.3 ft | 39.2 µg/L | - |
| 50 | Pool on Lake St. Croix | Washington | C | 5.9 ft | 32.9 µg/L | - |