| Value | Category | Cases | |
|---|---|---|---|
| 1 | Wastewater network | 202 |
38.8%
|
| 2 | Tight cesspit | 100 |
19.2%
|
| 3 | Porous cesspit | 211 |
40.6%
|
| 4 | Randomly | 2 |
0.4%
|
| Sysmiss | 5 |