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Cilj vsakega upravljavca javnega vodovoda je zmanjšanje vodnih izgub oz. neprodane vode na ustrezen nivo. Do sedaj se je v slovenskem prostoru ta nivo opredeljeval kot delež izgubljene vode glede na zajeto količino le-te, ciljne vrednosti pa so bile določene s smernicami na nivoju države in Evropske unije, pri čemer se je premalo pozornosti posvečalo obravnavanju procesa zmanjševanja vodnih izgub z ekonomskega stališča. Kot pojem so vodne izgube v strokovni literaturi pomanjkljivo definirane, magistrska naloga se ukvarja s tistimi dejanskimi izgubami, ki se izražajo kot puščanja zaradi okvar na vodovodu, čeprav je potrebno stremeti tudi k zmanjšanju celotne neprodane vode (angl. non-revenue water). Ekonomsko sprejemljive vodne izgube nastopijo takrat, ko dosežemo ravnotežje med stroški, ki nastanejo pri odpravljanju puščanj, ter prihranki, ki nastanejo z naslova realizacije tega procesa (zmanjšanje količin izgubljene pitne vode). V osnovi se delijo na kratkoročne (angl. Short Run ELL) ter dolgoročne (angl. Long Run ELL). Pri določitvi SRELL so v izračun vključeni stroški aktivne kontrole puščanj ter stroški vode, pri določanju LRELL pa upoštevamo stroške obnov in investicijskega vzdrževanja ter tudi tu strošek vode. Za določitev ekonomsko sprejemljivih vodnih izgub, tako kratkoročnih kot dolgoročnih, se običajno uporabljata metoda skupnih stroškov in metoda mejnih stroškov. Cilj naloge je združiti ekonomska stališča s prakso iz upravljanja vodovodnih sistemov ter nato določiti ekonomsko sprejemljive vodne izgube na praktičnem primeru z namenom, da se ugotovijo morebitni problemi pri samem izračunu ter da se na podlagi dobljene vrednosti ELL oblikujejo smernice, kako dejansko doseči ekonomsko učinkovito zmanjšanje vodnih izgub, oziroma celotne neprodane količine pitne vode. The aim of every operator of public water supply is to reduce water losses or non-revenue water to an adequate level. Until now, this level in Slovenia has been defined as the proportion of non-revenue water with regard to the extracted amount of it. However, the targeted values have been defined by guidelines on the national and on the level of the European Union, wherein not enough attention has been paid to dealing with the process of reducing water losses from the economic standpoint. As a concept, water losses are inadequately defined in technical literature. The Master’s thesis deals with the actual losses that are expressed as leakages due to defects on the public water supply, although it is necessary to aim at reducing the total amount of non-revenue water. The economic level of leakage is achieved by balancing the costs that occur when reducing leakage and the savings from directing the realisation of this process (reducing the amount of drinking water leakage). Fundamentally, costs are divided into the Short Run ELL and the Long Run ELL. To determine the SRELL, costs of active leakage control and water costs are included in the calculation, while to determine the LRELL, costs of pipe replacements and investment maintenance, as well as water costs are taken into account. To determine the Short Run and the Long Run Economic Level of Leakage, mainly the method of total costs and the method of marginal costs are used. The aim of the thesis is to combine economic standpoints with the practice of management of water supply systems and then determine the economic level of leakage with a practical example. The purpose is to detect potential problems with the calculation and on the basis of the obtained ELL value determine the guidelines on how to actually achieve the economic level of leakage or of the whole amount of non-revenue water.