Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Ottawa County | 6 | 33 |
| Perry County | 12 | 38 |
| Pickaway County | 13 | 40 |
| Pike County | 7 | 46 |
| Portage County | 1 | 0 |
| Preble County | 1 | 1 |
| Putnam County | 2 | 5 |
| Ross County | 39 | 264 |
| Sandusky County | 22 | 47 |
| Scioto County | 9 | 30 |
| Stark County | 4 | 6 |
| Summit County | 19 | 40 |
| Trumbull County | 3 | 7 |
| Tuscarawas County | 5 | 21 |
| Vinton County | 4 | 8 |
| Warren County | 16 | 132 |
| Washington County | 5 | 8 |
| Wayne County | 2 | 5 |
| Wood County | 17 | 76 |
| Wyandot County | 7 | 47 |