In this final paper, the conceptual design of the sanitary waste water drainage system for the town of Vrbovsko was elaborated, including the village of Jablan, Senjsko street and the town of Vrbovsko itself. The conceptual project for the described location was elaborated according to the Environmental Protection Elaborate and the Spatial Plan of the town of Vrbovsko. The project task was to determine the route of the sewage network according to the foundations extracted from the geoportal site, to show the hydraulic calculation and dimensioning, and to draw the longitudinal profiles and details of the installation of the collector. All drawings were made to scale, in the AutoCAD 2020 program. Among other things, examples of static and pumping station calculations were given. The example of the pumping station was selected from the Grundfos catalog, and the PVC pipes of the collector from the Vargon system catalog. In the proposed conceptual solution, all waste water is brought to the purification device with an already predefined position, and after purification it is released into the ground. The paper also contains the approximate costs of building the system and the basic calculations and designs for the future development of the drainage system of the town of Vrbovsko.