ONEP's mission is to provide the State and local authorities with its assistance in order to ensure access to drinking water for populations throughout the territory.
- As such, the Office exercises, within the framework of the implementation of its missions of engineering, management of funds, management of the public and private heritage of the State and, regulation, in terms of hydraulics human: planning supply and demand for drinking water;
- Delegated project management or project management of investments for the construction, extension, strengthening and renewal of drinking water supply infrastructure;
- The control, protection and monitoring of water resources likely to be used for the production of drinking water;
- Defending the interests of users of the public drinking water service.