| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 1506 |
39.1%
|
| 2 | Porous Cesspit | 832 |
21.6%
|
| 3 | Tight Cesspit | 300 |
7.8%
|
| 4 | Others | 613 |
15.9%
|
| Sysmiss | 603 |