| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 2005 |
52%
|
| 2 | Porous Cesspit | 1475 |
38.3%
|
| 3 | Tight Cesspit | 366 |
9.5%
|
| 4 | Others | 8 |
0.2%
|