| Percent Samples with Fecal Coliform bacteria more than 200 CFU/100 mL | |||||||
| Watershed | Mar-Apr | May-Jun | Jul-Aug | Sep-Oct | Winter | All Seasons | |
| Bois De Sioux | 13 | 19 | 32 | 20 | 20 | 21 | |
| Mustinka | 0 | 0 | 0 | 0 | 17 | 7 | |
| Otter Tail | 7 | 25 | 55 | 30 | 11 | 26 | |
| Upper Red | 22 | 32 | 46 | 39 | 24 | 32 | |
| Western Wild Rice | 5 | 6 | na | 33 | 0 | 6 | |
| Buffalo | 11 | 31 | 56 | 25 | 39 | 33 | |
| Elm-Marsh | 25 | 41 | 56 | 46 | 35 | 40 | |
| Eastern Wild Rice | 5 | 13 | 30 | 19 | 0 | 13 | |
| Goose | 11 | 18 | 24 | 15 | 2 | 12 | |
| Devils Lake | 0 | na | na | na | na | 0 | |
| Upper Sheyenne | na | na | na | na | na | ||
| Middle Sheyenne | 0 | 20 | 0 | 11 | 0 | 7 | |
| Lower Sheyenne | 13 | 19 | 44 | 28 | 17 | 23 | |
| Maple | 0 | 8 | 0 | 20 | 0 | 4 | |
| Sandhill-Wilson | 7 | 13 | 21 | 14 | 8 | 12 | |
| Red Lakes | na | 17 | 8 | 67 | 50 | 13 | |
| Red Lake | 29 | 16 | 29 | 40 | 69 | 37 | |
| Thief | na | na | na | na | na | na | |
| Clearwater | 4 | 23 | 52 | 26 | 3 | 26 | |
| Grand Marais - Red | 39 | 58 | 70 | 65 | 72 | 62 | |
| Turtle | 0 | 17 | na | 0 | 0 | 8 | |
| Forest | 0 | 0 | 25 | 11 | 0 | 7 | |
| Snake | 23 | 6 | 6 | 36 | 7 | 15 | |
| Park | 1 | 9 | 27 | 12 | 0 | 9 | |
| Lower Red | 9 | 8 | 28 | 21 | 20 | 17 | |
| Two Rivers | 33 | 38 | 53 | 31 | 29 | 37 | |
| Pembina | 2 | 7 | 16 | 8 | 2 | 6 | |
| Reseau | 17 | 21 | 6 | 15 | 24 | 17 | |