Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Greene County | 9 | 24 |
| Huntingdon County | 7 | 54 |
| Indiana County | 8 | 73 |
| Jefferson County | 0 | 0 |
| Juniata County | 7 | 26 |
| Lancaster County | 21 | 99 |
| Lawrence County | 5 | 20 |
| Luzerne County | 18 | 99 |
| Lycoming County | 12 | 55 |
| McKean County | 1 | 2 |
| Mercer County | 4 | 18 |
| Monroe County | 8 | 65 |
| Montgomery County | 2 | 3 |
| Northampton County | 12 | 49 |
| Northumberland County | 11 | 92 |
| Perry County | 5 | 187 |
| Philadelphia County | 3 | 14 |
| Pike County | 13 | 92 |
| Snyder County | 6 | 29 |
| Somerset County | 21 | 181 |
| Susquehanna County | 1 | 6 |
| Tioga County | 9 | 61 |
| Union County | 3 | 37 |
| Venango County | 3 | 15 |
| Warren County | 14 | 28 |