Water is a strategic resource that is of great importance in the modern world. With population growth and economic development, the need for water increases, while at the same time various forms of pollution pose a challenge for its preservation. Human activities, such as irresponsible exploitation of water sources and pollution with industrial and agricultural waste, have a negative impact on water quality. Climate change, including increases in temperature and changes in precipitation patterns, also has a significant impact on water resources. The objectives of this final paper are to analyze the state and quality of water management in the Republic of Croatia and to assess its role in the sustainable management of water resources and meeting the needs of various economic sectors. Many factors affect water management, so different activities and measures are needed to ensure sustainable water use. The analysis of the existing documentation showed that the quality of drinking water in Croatia is generally good, but also that the state of water management in the Republic of Croatia requires improvement in order to ensure the sustainable use of water resources. The question of the quality of drinking water and the services provided by water supply Osijek was also dealt with in the empirical part of the work. The survey was conducted in August 2023 in the area of the city of Osijek, and its results proved to be consistent with those previously mentioned, which were conducted for the Republic of Croatia. In addition, many respondents pointed out that drinking water must be a fundamental right of every human being, and the majority of respondents declared against the privatization of water supply Osijek.