Due to the slow spread of public water supply systems in rural areas mostly in the second half of the 20th century, private water supply systems were built in that place. Slovenian Regulation on drinking water stipulates on which areas drinking water supply should be the task of the local economic public service. Master’s thesis focused on Slovenian municipalities’ approaches to the establishment of a public system in areas with an existing private water supply system. First part of the thesis presents main characteristics of small water supply systems and how the optimal size of system or economic public service can be made. It was established that smaller systems are significantly more exposed to fluctuations in the quality and quantity of drinking water. In determining the optimal size of systems, there are large differences between countries due to their local features. In the second part we analyzed a questionnaire in which a quarter of Slovenian municipalities were included. Municipalities marked 70 % of the transfers as challenging. The main challenges are long lasting process, oppositions of owners, and insufficient water system records. In cases where procedures were not challenging, the opposition of the inhabitants did not occur. The owners of water supply systems were interested in transfers when problems occurred (lack of water, pollution, inability to maintain). We have examined in more detail the case of the transfer of a private water supply system in the municipality of Žetale. The transfer to the municipality was not demanding because the owners were cooperative due to the dry season and lack of drinking water. Based on the analysis of the questionnaires, we have put forward suggestions for improving the data monitoring system and providing guidance to municipalities on how to approach transfers.
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