The topic of this specialist graduate thesis is the statistical analysis of the service area of Vodovod grada Vukovara Ltd. (Water supply company of city of Vukovar) which includes the area of Vukovar together with the suburbs of Sotin and Lipovača and the municipalities of Bogdanovci, Borovo, Trpinja, Tompojevci and Negoslavci. Service area of the Vodovod grada Vukovara Ltd. is supplied with two water intakes, the underground water intake pumping station Cerić and the surface water intake river Danube, which makes up more than 93% of the captured water. The service area is covered with almost 387 km of water supply network of profiles larger than 50 mm and more than 200 km of network of connections with profiles smaller than 50 mm. In 2020, there were 20,746 connections in the service area, of which 19,369 are household connections and 1,377 are economic property connections. Furthermore, there are more than 1250 hydrants and more than 570 valve chambers in the service area. This paper analyzes water consumption, losses and failures in water supply pipelines. Losses were analyzed from the location of the water intake to the end user or consumer. Defects were analyzed according to the place of occurrence of the defect, pipeline, connection or hydrant, and according to the location or area of occurrence of the defect. The analysis period differs depending on the available data, and accordingly the losses in water production and supply were analyzed through the period 2010. - 2020. The analysis of failures on pipelines and connections was made for the period from 2003. - 2020., while the analysis of failures depending on the material of the pipeline was made for the period from 2015. to 2020. Analysis and data processing was performed in the software package MS Excel and Statistics Version 14.0. At the very end, the modeling of the degree of failures in the water supply network was made using Bayes' theorem.