| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 510 |
27.6%
|
| 2 | Porous Cesspit | 697 |
37.8%
|
| 3 | Tight Cesspit | 160 |
8.7%
|
| 4 | Othe | 275 |
14.9%
|
| Sysmiss | 203 |