| Value | Category |
|---|---|
| 01 | Tap water inside |
| 02 | Tap water outside |
| 03 | Public well |
| 04 | Private well |
| 05 | Rain water |
| 06 | River, canal, stream, waterfall |
| 07 | Bottled water |
| 08 | Others |
| 98 | Unknown |
| 99 | NIU (not in universe) |
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