| Value | Category | 
|---|---|
| NIU (not in universe) | |
| 1 | Piped water from network watermains inside dwelling | 
| 2 | Domestic water system e.g. piped from the well on the ground-plot of the building | 
| 3 | Network water tap only on the ground-plot of the building | 
| 4 | The water of the well in the courtyard is used | 
| 5 | The water from the street common well is used | 
| 6 | From other place |