ABSTRACT: Systematic state groundwater monitoring in Slovakia commenced in 1931 on 6 observation wells between Hlohovec and Leopoldov. This was performed each Wednesday, and groundwater monitoring was then extended to springs between 1952 and 1954 when the Hydrometeorological Institute began observation of water yield from 14 springs. The greatest expansion in state groundwater monitoring activities occurred from 1957 to 1962 when the institute observed groundwater quantity from over 3000 wells and springs. By 1962, 3,400 observation wells and 364 springs were being monitored, and automated limnigraph groundwater level measurement was then implemented in 1966; with evaluation and archiving dating from 1973. Fully automatic devices for groundwater level/yield monitoring with hourly measurement were employed from 1993. The measured data is used in hydrogeological studies and surveys and for water management plans and industrial and building construction; with current data utilization focusing on the effects of annual climate change on groundwater regimes. Monitoring is also concentrated on evaluating drought impact on groundwater quantity and groundwater level responses during and after floods.