Locations
| Name | Sites | Samples |
|---|---|---|
| Taney County | 2 | 6 |
| Tangipahoa Parish | 2 | 6 |
| Tanzania | 22 | 191 |
| Tarrant County | 3 | 29 |
| Taylor County | 0 | 0 |
| Telfair County | 16 | 21 |
| Teller County | 1 | 3 |
| Tensas Parish | 10 | 25 |
| Terrebonne Parish | 7 | 15 |
| Terrell County | 9 | 27 |
| Texas County | 3 | 12 |
| Thayer County | 1 | 1 |
| Tippah County | 1 | 2 |
| Tippecanoe County | 4 | 18 |
| Tipton County | 3 | 5 |
| Titus County | 21 | 208 |
| Todd County | 1 | 3 |
| Tolland County | 16 | 39 |
| Tompkins County | 1 | 2 |
| Towns County | 1 | 2 |
| Transylvania County | 1 | 1 |
| Trimble County | 1 | 2 |
| Troup County | 1 | 2 |
| Trousdale County | 2 | 10 |
| Tulsa County | 2 | 4 |
| Turkey | 10 | 80 |
| Turkmenistan | 1 | 0 |
| Tuscaloosa County | 11 | 138 |
| Twiggs County | 1 | 1 |
| Tyler County | 1 | 1 |