The preliminary design of the sanitary sewer-sewage wastewater Duzluk settlements are proposed and discussed three possible alternatives for each variant was made estimates of construction costs and the technical evaluation of solutions. After analysis, developed alternative solutions sanitary sewage system Duzluk settlements, as well as technically acceptable and economically the most profitable, was selected Option 1, or the construction of the distribution of sanitary sewer-sewage wastewater settlement Duzluk of pressure sewer connection to the sewerage system Orahovica. The backbone of the sewerage network of settlements Duzluk a main gravity sewer K.1. length of approximately 1,700 m, which is the recipient of other collectors and secondary network of settlements total length of approximately 3,500 m. The collected sanitary sewage effluent settlement Duzluk main compression station and trunk pressure pipeline length of approximately 1,350 m, will be transported to the sewage network Orahovice, towards the future Device for purifying waste water.