In the first part of the thesis the municipalities which were subject of the analysis of the construction costs of the waste water collection and treatment infrastructure were described. The addressed municipalities are: Brezovica, Logatec, Borovnica, Cerknica and Pivka. Different types of sewage collection disposal are briefly introduced as they were all considered as a viable option fort the planners of the whole sewage disposal and treatment
system. In the second part of the thesis legal basis for planning and construction of the system as well as pricing mechanisms for sewage disposal and treatment are analysed. Data from the project documentation, municipality reports and business plans are presented and compared. The purpose of comparisons is to identify possible deviations between planned and realized costs and prices for sewage disposal and treatment. Existing prices for specific areas are shown in the last section of the thesis and the methodology for their calculation. The prices are compared and analysed with identification of subsidies in some areas. Standardized bills for the sewage disposal and treatment provide a reader a better understanding of the actual cost for the end user. In the conclusions the importance of adequate cost estimates in the early stages of the project development is underlined which is essential part of feasibility study.