Sub-locations
| Name | Sites | Samples |
|---|---|---|
| Androscoggin County | 7 | 19 |
| Aroostook County | 2 | 2 |
| Cumberland County | 6 | 33 |
| Franklin County | 1 | 1 |
| Hancock County | 20 | 296 |
| Kennebec County | 4 | 13 |
| Knox County | 3 | 65 |
| Lincoln County | 9 | 37 |
| Oxford County | 11 | 60 |
| Penobscot County | 16 | 82 |
| Piscataquis County | 11 | 82 |
| Sagadahoc County | 10 | 43 |
| Somerset County | 15 | 31 |
| Waldo County | 3 | 4 |
| Washington County | 5 | 16 |
| York County | 7 | 21 |