Locations
| Name | Sites | Samples |
|---|---|---|
| Grenada County | 1 | 2 |
| Grimes County | 7 | 29 |
| Guadalupe County | 0 | 0 |
| Guadalupe County | 2 | 7 |
| Guilford County | 1 | 1 |
| Gulf County | 9 | 17 |
| Gwinnett County | 1 | 2 |
| Haakon County | 1 | 5 |
| Hale County | 3 | 6 |
| Hale County | 1 | 14 |
| Hamilton County | 7 | 18 |
| Hamilton County | 3 | 56 |
| Hancock County | 2 | 6 |
| Hand County | 1 | 1 |
| Hanover County | 1 | 3 |
| Haralson County | 2 | 3 |
| Hardee County | 2 | 11 |
| Hardin County | 4 | 8 |
| Hardin County | 9 | 68 |
| Hardin County | 1 | 4 |
| Harding County | 1 | 1 |
| Harford County | 3 | 8 |
| Harper County | 2 | 5 |
| Harris County | 15 | 73 |
| Harrison County | 2 | 4 |
| Harrison County | 14 | 167 |
| Haskell County | 6 | 25 |
| Hawkins County | 3 | 15 |
| Haywood County | 1 | 15 |
| Hemphill County | 2 | 8 |