Water is not a commercial product but a heritage that needs to be preserved, protected and used wisely and rationally. Waters are managed according to the principle of unity of the water system and the principle of sustainable development, which meets the needs of the current generation and does not endanger the rights and opportunities of future generations. The waters are of good interest to the Republic of Croatia and have its special protection. Water assets are real estates that have been declared a good of interest to the Republic of Croatia by a special law and have its special protection. Water assets are real estate and land plots in the ownership regime that can be owned by any legal or natural person. However, if the Republic of Croatia has the right of ownership over them, the real estate of the water domain is then in the legal status of a public good in general use and is subject to significantly greater restrictions in relation to the possibility of use, use and disposal.