The treasury is a significant and most efficient element of public finances of countries within which the budget is formed and public funds are allocated that can effectively finance public services and meet the needs of citizens, as well as effectively manage cash and public debt. In the context of the state treasury, there are many problems that the state faces, such as the impossibility of insight into the real state of state finances, the state of its deposits or the number of accounts opened in commercial banks. Sustainable local treasuries are believed to support the modern and sustainable development of local units, which implies it at the national level as well. These are systems that contribute to better development of the state, greater competitiveness, ethics, but also better opportunities for progress in all segments. The city of Pula is a unique local government that is the most developed in Istria, and the size of its budget can match larger Croatian cities, so it is an ideal candidate for the introduction of local treasury systems for effective management of their public finances. It processes the treasury system so that it monitors the state level, and the same form was modeled based on the state treasury in 2011. It has thus generated a number of positive effects for its public finances that are visible to progress in its development, economy and financial operations. The importance of the local treasury of the City of Pula is its basic advantage that everything is predetermined as the financial management of the single account of the City and thus risk in the operation of public finances of the City is significantly reduced.