Locations
| Name | Sites | Samples |
|---|---|---|
| George County | 1 | 2 |
| Georgetown County | 5 | 20 |
| Georgia | 18 | 144 |
| Germany | 839 | 3969 |
| Ghana | 0 | 0 |
| Gibson County | 3 | 11 |
| Gilchrist County | 1 | 2 |
| Giles County | 2 | 6 |
| Glades County | 3 | 36 |
| Gloucester County | 3 | 22 |
| Glynn County | 11 | 35 |
| Goochland County | 2 | 3 |
| Grafton County | 4 | 24 |
| Graham County | 1 | 12 |
| Grand Isle County | 3 | 13 |
| Granite County | 1 | 4 |
| Grant County | 1 | 1 |
| Grant County | 1 | 3 |
| Grant County | 1 | 3 |
| Grayson County | 1 | 2 |
| Greece | 38 | 168 |
| Greenbrier County | 1 | 2 |
| Greene County | 2 | 9 |
| Greene County | 3 | 46 |
| Greene County | 3 | 8 |
| Greene County | 6 | 14 |
| Greenland | 18 | 273 |
| Greensville County | 1 | 1 |
| Greenville County | 2 | 16 |
| Gregg County | 2 | 4 |