http://creativecommons.org/licenses/by/4.0/legalcode 2022 https://unilib.phaidrabg.rs/o:1678 non-revenue water; water supply system; pressure; network; losses info:eu-repo/semantics/conferenceProceedings application/pdf 628738 bytes eng Abstract: Non-revenue water (NRW) can be expressed using different parameters (indices) in cer-tain water supply systems (WSSs). The most used are percentages (as a share of NRW in system input water) and the infrastructure leakage index (ILI) based on the IWA methodology. The tech-nical indicator of real losses (TIRLs) is also an index used for the estimation of certain WSS efficiency. Both real and apparent losses are significant in many WSSs in the Balkan region. Thirty-seven WSSs in Serbia and Montenegro, which differ in many aspects, were analyzed. After presenting the meth-odology and discussing the results, a conclusion is drawn, as well as general guidelines regarding the approach for the reduction of NRW for this region. Dimkić, Dejan Babalj, Marko Kovač, Darko Papović, Mira Non-Revenue Water in Water Supply Systems of Serbia and Montenegro MDPI, Basel, Switzerland International Conference EWaS5, 12–15 July 2022, Naples, Italy, Environmental Sciences Proceedings 21