ABSTRACT: Groundwater play a decisive role in the water supplies in Slovakia. More accurate assessment of prognostic natural and exploitable groundwater amounts form the preconditions for appropriate utilization of groundwater by water management system due with requirements of Directive 2000/60/EC establishing a framework for EÚ Community action in the field of water policy (WFD). This process reduces the main risk of groundwater bodies of failing to achieve environmental objectives. On the other hand allows the water management system to abstract maximal amount of groundwater in harmony with Directive 2000/60/EC and Slovak Water Low also. One of the limiting factors, influencing the use of water, are global climate changes that reduce groundwater yields in springs and decrease groundwater reserves. This phenomenon was registered for most regions in Slovakia since 1980. The re-assessment and update of natural groundwater sources and resources in the groundwater bodies provides for hydrogeologists to be closer to reality in the process of water management strategy. This professional approach eliminates programme of measures in river basin management plans and reduces negative impact of groundwater abstraction on the ecosystem in the near future and mainly in 2015 (fulfilment of WFD requirements).