| Value | Category | Cases | |
|---|---|---|---|
| 1 | Sewage system | 5640 |
37.3%
|
| 2 | Covered septic tank | 8389 |
55.5%
|
| 3 | Open drain | 1050 |
7%
|
| 97 | Other | 28 |
0.2%
|
| Sysmiss | 1323 |