In this final project, the conceptual design of the water supply system was developed for the Dubac-Varsan bay, located on the island of Pag in Lika-Senj County. The initial part of the project presents general information about the water supply system, the goal of building a water supply system and analyzes the input data that needs to be collected for the development of the conceptual design of the water supply system. Based on the defined input data, a hydraulic calculation was performed. The procedures of all calculations required for sizing the water supply network are described in detail. The final part of the project presents a functional design and tehnical solution which describe in more detail the method of excavating trenches for water pipes, laying the water pipes and the method of installing plumbing fittings, as well as the shutters. All tasks of the construction of the water supply system were analyzed to obtain the total approximate price of all above-mentioned tasks for the construction of water network in Dubac-Varsan bay. Graphic representations in the form of a situation on a digital ortophoto map, longitudinal profiles of the main pipelines and the normal characteristic cross-section of the trench are given as part of the appendix.