1.    To provide technical advisory services to the ministry and other agencies in planning, designing, implementing and managing water supply programmes
2.    To plan, implement, coordinate and monitor national water supply development programmes/projects to meet the targets that fulfil the needs of the people and nation
3.    To plan, monitor and implement the development of water resources
4.    To monitor the quality of raw water at intakes in Malaysia and of treated water in Sabah and Sarawak
5.    To carry out safety monitoring on high-risk water supply dams and tanks on slopes
6.    To serve as committee member (SIRIM and SPAN) in preparing the list of approved materials for water supply projects
7.    To act as certifying agent for the Sungai Langat Water Treatment Plant implemented by PAAB
8.    To plan, implement and monitor NRW programmes
9.    To plan, prepare and maintain water supply infrastructure for domestic and industrial requirements in Labuan Island