| Value | Category | Cases | |
|---|---|---|---|
| 1 | Public sewage system | 23623 |
56.2%
|
| 2 | Absorbing hole | 18133 |
43.2%
|
| 3 | None | 236 |
0.6%
|
| 97 | Other (specify) | 20 |
0%
|