In the last years an increase in temperature of the ground water body under the city centre of Linz could be observed. One main reason therefore is the thermal use of ground water for cooling of buildings and industrial processes with individual groundwater cooling systems. To derive solutions with positive effects on the groundwater situation different scenarios for future (district) cooling systems in the city of Linz are developed and investigated regarding their feasibility and influences on ground water temperature. The investigated scenarios comprise a null scenario, a central district cooling scenario with cooling water taken from the nearby Danube and a semi central scenario with ground water district cooling systems in several different locations. The project is funded by the provincial government of Upper Austria.