Locations
| Name | Sites | Samples |
|---|---|---|
| Burleson County | 2 | 10 |
| Burnet County | 1 | 1 |
| Burundi | 1 | 11 |
| Caddo Parish | 6 | 20 |
| Caldwell County | 5 | 37 |
| Caldwell Parish | 1 | 2 |
| Calhoun County | 1 | 1 |
| Calhoun County | 2 | 14 |
| Calhoun County | 2 | 10 |
| Calhoun County | 1 | 4 |
| Calhoun County | 10 | 37 |
| Calumet County | 2 | 4 |
| Camden County | 10 | 76 |
| Camden County | 1 | 8 |
| Cameron County | 3 | 4 |
| Cameron County | 3 | 6 |
| Cameroon | 1 | 6 |
| Camp County | 15 | 137 |
| Campbell County | 1 | 1 |
| Canada | 2947 | 9280 |
| Canadian County | 1 | 7 |
| Cape Girardeau County | 1 | 8 |
| Carbon County | 2 | 5 |
| Carbon County | 70 | 104 |
| Carroll County | 2 | 3 |
| Carroll County | 1 | 9 |
| Carroll County | 6 | 19 |
| Carroll County | 1 | 2 |
| Carter County | 1 | 4 |
| Carteret County | 4 | 19 |