| Value |
Category |
| 1 |
Under the ground |
| 2 |
Sewerage |
| 3 |
Open drain |
| 4 |
Open land/watercourse |
| 6 |
Other |
| 8 |
Don't know |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.