Agriculture is one of the biggest sources of surface water pollution in the Slovak territory because of large areas intensively used for agricultural production. The excessive impact of anthropogenic activities causes degradation of productivity of aquatic ecosystems and disturbances of the ecological balance. Data obtained in the monitoring period confirmed unfavourable status of surface waters in selected water reservoirs. Water policy should therefore aim at integrated protection of water resources, which should consist of integrated protection of water ecosystems and nature as whole.