| 36000 | Collection of rain water |
| 36000 | Collection of water from rivers, lakes, wells |
| 36000 | Desalting of sea or ground water to produce water |
| 36000 | Distribution of water through mains, by trucks or other means |
| 36000 | Operation of irrigation canals |
| 36000 | River management |
| 36000 | Sea water desalination |
| 36000 | Treatment of water for industrial and other purposes |
| 36000 | Water authority (headquarters and water supply) |
| 36000 | Water collection, purification and distribution |
| 36000 | Water company |
| 36000 | Water conservation |
| 36000 | |