Minnesota Lake Water Quality
Water quality grades for 2,454 monitored lakes across 72 counties.
A
729
Excellent
B
578
Good
C
497
Fair
D
346
Poor
F
304
Very Poor
Counties
B
Hubbard County
83 lakes
B
Cass County
154 lakes
B
Crow Wing County
135 lakes
B
Mille Lacs County
13 lakes
B
Beltrami County
87 lakes
B
Clearwater County
42 lakes
B
Otter Tail County
109 lakes
B
Itasca County
149 lakes
B
Douglas County
55 lakes
B
Lake of the Woods County
13 lakes
B
Morrison County
16 lakes
B
Becker County
92 lakes
B
Clay County
3 lakes
B
Lake County
171 lakes
B
Steele County
1 lakes
C
Cook County
144 lakes
C
Todd County
21 lakes
C
St. Louis County
198 lakes
C
Carlton County
41 lakes
C
Mahnomen County
17 lakes
C
Aitkin County
56 lakes
C
Washington County
31 lakes
C
Sherburne County
26 lakes
C
Pine County
19 lakes
C
Wadena County
4 lakes
C
Stearns County
58 lakes
C
Chisago County
38 lakes
C
Nicollet County
2 lakes
C
Isanti County
21 lakes
C
Wright County
65 lakes
C
Goodhue County
12 lakes
C
Pope County
26 lakes
C
Anoka County
26 lakes
C
Polk County
22 lakes
D
Ramsey County
51 lakes
D
Dakota County
43 lakes
D
Scott County
17 lakes
D
Koochiching County
8 lakes
D
Kandiyohi County
37 lakes
D
Meeker County
23 lakes
D
Carver County
42 lakes
D
Olmsted County
4 lakes
D
Hennepin County
117 lakes
D
Grant County
10 lakes
D
Le Sueur County
17 lakes
D
Kanabec County
7 lakes
D
Lincoln County
5 lakes
D
Wabasha County
4 lakes
D
Winona County
2 lakes
D
Rice County
12 lakes
D
Swift County
3 lakes
D
Yellow Medicine County
5 lakes
D
Jackson County
6 lakes
D
Cottonwood County
7 lakes
D
Watonwan County
5 lakes
D
Blue Earth County
9 lakes
D
McLeod County
5 lakes
D
Houston County
2 lakes
D
Murray County
2 lakes
F
Brown County
8 lakes
F
Big Stone County
13 lakes
F
Waseca County
6 lakes
F
Freeborn County
4 lakes
F
Stevens County
6 lakes
F
Renville County
2 lakes
F
Martin County
7 lakes
F
Lyon County
5 lakes
F
Redwood County
2 lakes
F
Benton County
2 lakes
F
Nobles County
4 lakes
F
Chippewa County
1 lakes
F
Pipestone County
1 lakes
Top 25 Cleanest Lakes
| Rank | Lake | County | Grade |
|---|---|---|---|
| 1 | East Fox Lake | Crow Wing | A |
| 2 | Deep Portage Lake | Cass | A |
| 3 | Little Wabana Lake | Itasca | A |
| 4 | Clearwater Lake | Cook | A |
| 5 | Clearwater Lake | Cook | A |
| 6 | Clearwater Lake | Lake | A |
| 7 | Lower Hay Lake | Crow Wing | A |
| 8 | Latoka Lake | Douglas | A |
| 9 | North Long Lake | Crow Wing | A |
| 10 | Bad Medicine Lake | Becker | A |
| 11 | Big Sugar Bush Lake | Becker | A |
| 12 | Pelican Lake | Otter Tail | A |
| 13 | Fullers Lake: East | Beltrami | A |
| 14 | Birch Lake | Wright | A |
| 15 | Birch Lake | Cook | A |
| 16 | Birch Lake | Lake | A |
| 17 | Round Lake | Aitkin | A |
| 18 | Round Lake | Cook | A |
| 19 | Pike Lake | Cook | A |
| 20 | Pike Lake | St. Louis | A |
| 21 | Whitefish Lake | Crow Wing | A |
| 22 | Whitefish Lake | Crow Wing | A |
| 23 | Minnetonka Lake | Hennepin | A |
| 24 | Minnetonka Lake | Hennepin | A |
| 25 | Horseshoe Lake | Cass | A |
25 Lakes Needing Attention
| Rank | Lake | County | Grade |
|---|---|---|---|
| 1 | Lower Sioux Hank Lake | Redwood | F |
| 2 | Dune Lake | Beltrami | F |
| 3 | Fourth Lake | Chisago | F |
| 4 | Gonz Lake | Wright | F |
| 5 | Snyder Lake | Hennepin | F |
| 6 | East Arctic Lake | Scott | F |
| 7 | Tadd Lake, 0.25 Mi S of Hwy 12. Atwater | Kandiyohi | F |
| 8 | Manomin Lake | Lake | F |
| 9 | South Stanchfield Lake | Isanti | F |
| 10 | Kauppi Lake | St. Louis | F |
| 11 | Kansas Lake | Watonwan | F |
| 12 | North Stanchfield Lake | Isanti | F |
| 13 | Upper Tad Lake | Kandiyohi | F |
| 14 | Gleason Lake | Hennepin | F |
| 15 | Mountain Lake | Cottonwood | F |
| 16 | Bella Lake | Nobles | F |
| 17 | Beaulieu Lake | Mahnomen | F |
| 18 | Olson Lake | Big Stone | F |
| 19 | Little Kettle Lake | Carlton | F |
| 20 | Grossman Slough Lake | Stevens | F |
| 21 | Grey Cloud Slough Lake | Washington | F |
| 22 | Mcmahon Lake | Scott | F |
| 23 | Greenleaf Lake | Meeker | F |
| 24 | Fisher Lake | Scott | F |
| 25 | Marshan Lake | Anoka | F |