| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 586 |
31.7%
|
| 2 | Porous Cesspit | 960 |
52%
|
| 3 | Tight Cesspit | 289 |
15.7%
|
| 4 | Other | 11 |
0.6%
|