Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Antelope County | 0 | 0 |
| Boone County | 1 | 6 |
| Boyd County | 4 | 42 |
| Brown County | 1 | 5 |
| Buffalo County | 3 | 7 |
| Burt County | 2 | 13 |
| Butler County | 1 | 4 |
| Cass County | 12 | 29 |
| Cedar County | 2 | 4 |
| Chase County | 1 | 4 |
| Cheyenne County | 1 | 0 |
| Colfax County | 1 | 2 |
| Custer County | 5 | 11 |
| Dakota County | 1 | 2 |
| Dawes County | 1 | 3 |
| Dawson County | 1 | 2 |
| Dixon County | 1 | 3 |
| Dodge County | 0 | 0 |
| Douglas County | 3 | 9 |
| Franklin County | 4 | 8 |
| Frontier County | 24 | 105 |
| Gage County | 1 | 5 |
| Garden County | 2 | 36 |
| Gosper County | 1 | 4 |
| Hall County | 1 | 2 |