MSc thesis focuses on the problem of water loss in water supply systems. Detection of water leakage is crucial for management and reduction of water loss. Theoretical part of the MSc thesis focuses on development of a measuring campaign, supported by variety of digital technologies, with a goal of identifying the sections of water supply system with the highest amount of water leakage. In the practical part of the MSc thesis we describe the implementation of planned campaign, with the help of the water supply service provider, and analyse its results.