| Value | Category |
|---|---|
| 0 | |
| 1 | water system at home |
| 2 | water tap in the yard or district |
| 3 | well in the yard or district |
| 4 | natural spring in the yard or district |
| 5 | river, lake, spring, channel |
| 6 | others ( please specify) |
| 7 | |
| 8 | |
| 10 | |
| 11 | |
| 14 | |
| 18 | |
| 20 | |
| 21 | |
| 24 | |
| 32 | |
| 33 | |
| 34 | |
| 124 | |
| 224 | |
| Sysmiss |