| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater network | 1569 |
52.8%
|
| 2 | Porous cesspit | 1169 |
39.3%
|
| 3 | Tight cesspit | 211 |
7.1%
|
| 4 | Others | 22 |
0.7%
|