| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Public network | 3254 |
49.2%
|
| 2 | 1. Porous cesspit | 2289 |
34.6%
|
| 3 | 2. Tight cesspit | 1008 |
15.3%
|
| 4 | 2. Others | 55 |
0.8%
|
| Sysmiss | 2 |