| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater Network | 1022 |
41.5%
|
| 2 | Porous Cesspit | 1075 |
43.6%
|
| 3 | Tight Cesspit | 359 |
14.6%
|
| 4 | Other | 7 |
0.3%
|