Locations
| Name | Sites | Samples |
|---|---|---|
| Stark County | 2 | 6 |
| Stearns County | 1 | 2 |
| Stephens County | 2 | 5 |
| Stephens County | 1 | 1 |
| Sterling County | 1 | 1 |
| Steuben County | 1 | 2 |
| Stevens County | 1 | 4 |
| Stoddard County | 1 | 4 |
| Stokes County | 3 | 3 |
| Stone County | 1 | 5 |
| Suffolk County | 16 | 70 |
| Suffolk County | 16 | 36 |
| Sullivan County | 1 | 1 |
| Sullivan County | 3 | 13 |
| Sumner County | 5 | 7 |
| Sumner County | 3 | 55 |
| Sumter County | 1 | 1 |
| Sumter County | 3 | 13 |
| Sunflower County | 2 | 5 |
| Surry County | 1 | 6 |
| Susquehanna County | 1 | 6 |
| Sutton County | 2 | 6 |
| Suwannee County | 1 | 4 |
| Swain County | 1 | 2 |
| Sweden | 265 | 1153 |
| Swisher County | 1 | 5 |
| Switzerland | 143 | 672 |
| Switzerland County | 2 | 17 |
| Talladega County | 2 | 7 |
| Tallahatchie County | 1 | 4 |