Leaks occurring in distribution systems constitute a significant part of water losses. Active leak control methods (district metered area, minimum night flow analysis, repair speed and quality) are applied to manage and control the leaks. It is very important to use appropriate indicators to determine and monitor the performance in the process, and compare the systems with each other. In this study, it was aimed to use the infrastructure leakage index (ILI) proposed by International Water Association (IWA) and considered as the unique indicator that is used to compare systems with each other in order to analyze and monitor system performance in leakage management for pilot regions. However, the use of this indicator, which is preferred by a limited number of utilities in Turkey due to the lack of information and awareness, and lack of technical infrastructure, requires basic data representing the system characteristics. Based on the pilot case studies, the role and advantage of this indicator in leakage management, the problems experienced and the interpretation of the results were discussed. With this indicator, it is possible to determine the leakage level in the current conditions and to determine the most suitable process accordingly. It is thought that this study will make a significant contribution to technical personnel in terms of leakage management.