Locations
| Name | Sites | Samples |
|---|---|---|
| Choctaw County | 4 | 11 |
| Chowan County | 2 | 2 |
| Citrus County | 13 | 108 |
| Clark County | 1 | 2 |
| Clark County | 5 | 10 |
| Clark County | 4 | 22 |
| Clarke County | 8 | 17 |
| Clarke County | 1 | 1 |
| Clay County | 1 | 3 |
| Clay County | 1 | 4 |
| Clay County | 10 | 41 |
| Clay County | 1 | 2 |
| Clay County | 1 | 1 |
| Clay County | 6 | 28 |
| Clay County | 2 | 8 |
| Clay County | 4 | 10 |
| Cleveland County | 2 | 8 |
| Clinton County | 1 | 3 |
| Clinton County | 1 | 2 |
| Cloud County | 1 | 1 |
| Coal County | 1 | 11 |
| Cocke County | 1 | 2 |
| Coffee County | 7 | 23 |
| Coffee County | 13 | 87 |
| Coke County | 3 | 4 |
| Coleman County | 2 | 8 |
| Colfax County | 1 | 2 |
| Colleton County | 1 | 1 |
| Collier County | 50 | 271 |
| Colombia | 1 | 2 |