ABSTRACT: The paper presents a basic information about the groundwater sources and the distribution of exploitable amounts of groundwaters in individual geologicaI units of Slovakia. Out of 74.18 m3/s of exploitable sources only 26 percent are, at present, used as water supplies. Since 1991 the consumption of groundwater has seen a steady decrease. An outline of the main problems related to the use of groundwaters in water supplies as well to taks to be solved in this connection, has been made.