| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 921 |
37.4%
|
| 2 | Porous Cesspit | 771 |
31.3%
|
| 3 | Tight Cesspit | 283 |
11.5%
|
| 4 | Othe | 287 |
11.7%
|
| Sysmiss | 201 |