As at 1 April 2012, Water Supplies Department has an establishment of 4,404 staff members, some 349 being professional and assistant professional officers.
| Professional | |
| Civil Engineers | 231 |
| Electrical Engineers | 38 |
| Mechanical Engineers | 41 |
| Waterworks Chemists | 26 |
| Accountants | 6 |
| Land Surveyor | 1 |
| Quantity Surveyors | 2 |
| Geotechnical Engineers | 2 |
| Landscape Architect | 1 |
| Statistician | 1 |
| Subtotal : | 349 |
| Technical Staff | 1,957 |
| General and Junior Staff | 2,098 |
| Total : | 4,404 |