Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Hubbard County | 2 | 7 |
| Itasca County | 6 | 19 |
| Jackson County | 1 | 5 |
| Kanabec County | 1 | 1 |
| Kandiyohi County | 2 | 5 |
| Kittson County | 1 | 2 |
| Koochiching County | 4 | 63 |
| Lake County | 2 | 6 |
| Lincoln County | 1 | 15 |
| Lyon County | 1 | 2 |
| Mahnomen County | 1 | 1 |
| Marshall County | 2 | 14 |
| Martin County | 1 | 6 |
| Meeker County | 1 | 1 |
| Mille Lacs County | 20 | 84 |
| Morrison County | 1 | 0 |
| Murray County | 2 | 11 |
| Nicollet County | 5 | 17 |
| Norman County | 3 | 21 |
| Otter Tail County | 8 | 17 |
| Pine County | 1 | 3 |
| Polk County | 10 | 39 |
| Pope County | 2 | 3 |
| Redwood County | 1 | 8 |
| Sherburne County | 2 | 3 |