| Region | Location | No. of samples | Depth (m) |
| Mosul | Al-Hamedat | 3 | 1, 2, 3 |
| Al-Rashidia | 3 | 1,2, 4 | |
| Baghdad | Al-Karada | 4 | 2, 4, 8, 13 |
| Al-Jadrea | 4 | 2, 4, 8, 13 | |
| Basrah | Al-Rumaila | 3 | 1, 5, 10 |
| Al-Hartha | 4 | 2, 6, 13, 24 |