ABSTRACT: The Popradská kotlina basin is located in the north-eastern part of Slovakia. It is part of the Levočská panva basin, which is one of the 27 prospective areas in Slovakia with the occurrence of geothermal waters. The main goal of this paper is to characterize the hydraulic properties of the Quaternary and Palaeogene rocks of the Popradská kotlina basin which create the cap rocks of geothermal water Mesozoic aquifers. The results of hydrodynamic testing of 250 wells enabled a division of the complete data set into four sub-sets representing four different types of sediments; fluvial, glaciofluvial, glacial and Palaeogene flysch. The estimated hydraulic conductivity, transmissivity coefficient and transmissivity index were statistically and graphically processed. Fluvial sediments were shown to contain the best hydraulic properties. These recorded the highest average values for hydraulic conductivity and transmissivity coefficients. In some cases, the detailed study of hydraulic properties’ values revealed that it is the underlying Mesozoic aquifer which is represented by the estimated values of the transmissivity coefficients, and not the parameters of the cap rocks. Due to geological-structural conditions, the infiltration areas for geothermal waters are most likely located on the western and southern rim of the Popradská kotlina basin.