The purpose of writing the article is to study the effectiveness of water resources management in the Black Sea region of Ukraine in the context of sustainable development under the conditions of military operations. The theoretical approaches to defining the essence and functions of water resources management through the prism of sustainable development goals have been considered. The main problems of water resources management in the regions of Ukraine are systematised and the ways of their solution at the present stage of the reform are outlined. The author’s approach to evaluating the effectiveness of water resources management in the context of the model of sustainable development is proposed using the example of the Black Sea region of Ukraine. Methodical approaches to assessing the effectiveness of regional water resources management that includes the main stages, the criteria for assessing, indicators for each criterion, and a mathematical apparatus for their calculation have been developed. In accordance with the author’s approach, a diagnosis of the effectiveness of regional water resources management was conducted based on the example of the Black Sea region.