| Urban Wells | Year | |||
| 1989 | 1996 | 2006 | 2010 | |
| Mirpur | 0.01 | 0.00 | 0.00 | 0.01 |
| Sutrapur | 0.00 | 0.00 | 0.00 | 0.00 |
| Lalbagh | 0.00 | 0.01 | 0.01 | 0.00 |
| Mohammadpur | 0.05 | 0.02 | 0.00 | 0.01 |