Efficiency of implemented control depends on the degree of adequacy of used models of object. The article introduces the criteria characterizing the degree of closeness of obtained solutions when using different types of models of control object. The algorithm of estimation of quality and efficiency of water supply systems control depending on the volume and composition of operative information about the object under control is presented. Carried out researches have shown, that for maintenance of optimum values of criteria of quality and efficiency of water supply systems functioning on a control interval [0, T] it is enough to have pressure measurements in all local dictating points of a network. Further increase in number of measurements does not lead to improvement of these criteria values. Researches were carried out with the use of simulation modeling method of real water supply systems functioning. Information technologies for solving the whole range of tasks necessary for getting the result are described. The efficiency of realized control depends on the degree of the adequacy of using simulation models of the object. In the article the criteria that characterize the degree of the received solutions proximity are suggested using various forms of the water supply systems model. The algorithm of efficiency estimation of water supply systems control depending on the volume and content of the controlled object operational information is suggested. It is shown that to provide the optimum values of these criteria it is sufficient to have the pressure measures at all the local dictating points of the network. It is demonstrated that further increase of the numbers of measurements do not result in improvement of the criteria meaning. The research is carried out using the method of imitation modeling of the real water supply systems functioning.