Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Minnehaha County | 7 | 8 |
| Pennington County | 22 | 76 |
| Potter County | 2 | 5 |
| Roberts County | 3 | 6 |
| Sanborn County | 1 | 1 |
| Shannon County | 0 | 0 |
| Spink County | 1 | 4 |
| Stanley County | 16 | 69 |
| Sully County | 4 | 7 |
| Todd County | 1 | 3 |
| Union County | 0 | 0 |
| Walworth County | 6 | 15 |
| Ziebach County | 1 | 2 |