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| State | Source of water samples | Total | |||
|---|---|---|---|---|---|
| Borehole | Well | Stream | Tap | ||
| Abia | 1 | 1 | 2 | 4 | |
| Bauchi | 2 | 1 | 3 | ||
| Borno | 1 | 2 | 3 | ||
| Gombe | 1 | 1 | 2 | ||
| Ilorin | 1 | 1 | |||
| Kano | 2 | 2 | |||
| Lagos | 1 | 1 | 2 | ||
| Ogun | 1 | 1 | 1 | 3 | |
| Osun | 1 | 1 | 1 | 3 | |
| Total | 2 | 8 | 11 | 2 | 23 |
