The Loborika settlement currently does not have a built-in drainage system of sanitary wastewater. Sanitary wastewater is individually disposed of, which is the main problem of environmental protection and the protection sources of drinking water. On the territory of the Istrian county is determined by model of separate sewer sistem, which means that the stormwater is separated from sanitary wastewater, and in this case we are presenting a project solution for drainage of sanitary wastewater. Sanitary wastewater is collected in a watertight pipes and drains to the purifier device. The law-conditioned degree of purification before discharging water into the recipient satisfies only the MBR biological purification device. Thesis is made using the base from Geoportal DGU: digital ortofoto map 2014./2015. (1:5000), Croatian basic maps (1:5000), and all available legal regulations were respected. Software Urbano Canalis 9.0 by StudioARS d.o.o. were used for drafts and individual calculations. The graduate thesis includes: location data, detailed description of the sewage system elements, descriptive wastewater treatment device, and calculations of wastewater, hydraulic calculation, pump calculation and static calculation. In the second part of the paper this drafts are proposed: situation plans of sewage system, longitudinal profiles of the main collectors and details of the essential elements of the sewage system.