ABSTRACT: Water with their occurrence, quantity and quality parameters is one of factors importantly affecting the quality of life. Floods, groundwater level, groundwater aggressiveness and vulnerability were studied within the State research program Quality of life – health, nourishment and education by members of the Department of Hydrogeology. Methods for evaluation of spatial extent of endangerment by flooding, groundwater level evaluation, and methods of aggressiveness and vulnerability maps compilation were proposed. Proposed methods were applied on the territory of the Horná Nitra, which is one of the most heavily loaded regions by human activities in Slovakia.