Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Adams County | 7 | 17 |
| Alcorn County | 1 | 2 |
| Amite County | 2 | 9 |
| Bolivar County | 1 | 8 |
| Calhoun County | 1 | 4 |
| Carroll County | 1 | 9 |
| Chickasaw County | 3 | 11 |
| Choctaw County | 3 | 17 |
| Clay County | 6 | 28 |
| Coahoma County | 14 | 82 |
| DeSoto County | 2 | 10 |
| Forrest County | 2 | 6 |
| George County | 1 | 2 |
| Greene County | 3 | 8 |
| Grenada County | 1 | 2 |
| Hancock County | 12 | 42 |
| Harrison County | 2 | 4 |
| Hinds County | 2 | 14 |
| Holmes County | 6 | 50 |
| Humphreys County | 3 | 31 |
| Issaquena County | 4 | 20 |
| Itawamba County | 8 | 49 |
| Jackson County | 5 | 30 |
| Jefferson County | 4 | 7 |
| Jones County | 1 | 2 |