ABSTRACT: In paper there is refered the need of an increased utilizable groundwater potential in Slovakia, mainly in result of negative climatic changes impact on utilized groundwater amounts, necessity of ecological runoffs ensuring, as well as with regard to assumption of significant water need increase. There are proposed two ways of solution of this problem. The first of them is presented by more complex approach to evaluation of utilizable groundwater sources in direct connection to enumerated natural groundwater sources, taking in account limiting factors of their utilization and directed on determination of maximum utilizable portion from natural sources. The second one is a proposal of more extensive application of optimum combined groundwater sources and resources utilization.