Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Ionia County | 2 | 14 |
| Iosco County | 3 | 3 |
| Iron County | 1 | 1 |
| Isabella County | 1 | 2 |
| Jackson County | 2 | 2 |
| Kalamazoo County | 2 | 2 |
| Kent County | 5 | 21 |
| Keweenaw County | 8 | 29 |
| Lake County | 0 | 0 |
| Lapeer County | 3 | 13 |
| Leelanau County | 3 | 14 |
| Lenawee County | 1 | 3 |
| Mackinac County | 6 | 22 |
| Macomb County | 5 | 7 |
| Manistee County | 1 | 2 |
| Marquette County | 5 | 8 |
| Mason County | 1 | 0 |
| Menominee County | 2 | 28 |
| Midland County | 4 | 19 |
| Missaukee County | 2 | 3 |
| Monroe County | 10 | 23 |
| Montcalm County | 0 | 0 |
| Montmorency County | 1 | 1 |
| Muskegon County | 3 | 5 |
| Newaygo County | 5 | 7 |