This thesis deals with the optimization of drinking water abstraction in the Lower Mur Valley. On the one hand the valley aquifers represent outstanding reservoirs for drinking water supply, on the other hand the available areas and soils are perfect for intensive agricultural landuse. This results in an increased nitrogen input into the groundwater.In the year 2004 high-quality groundwater resources were developed in the wetlands of the river Mur in the Fluttendorf area. In 2006 two out of the four newly constructed wells exceeded the threshold value of nitrate of 50 mg/l. Detailed investigations confirmed a connection with the agricultural landuse on the high terrace. An immediate decrease of nitrogen fertilization would improve the situation only in about 20 years, because of the specific conditions and the residence time of nitrate in the soils.In order to find a short- and middle-term solution the Waterboard Grenzland Südost was given the permission to increase the water withdrawal for the wells Fluttendorf 2 and Donnersdorf 1, as well as to build an artificial groundwater recharge site, where water with low nitrate concentration is infiltrated into the aquifer. This water is mixed with the local groundwater, thereby lowering the nitrate concentration at the abstraction wells.The effectiveness of the artificial groundwater recharge was monitored between July 2011 and December 2012 using hydrological measurements, water sampling and chemical analyses at 15 sampling points. The data was evaluated using MS EXCEL, graphically processed and interpreted.The results of three monitoring phases are extremely positive. No side effects like impact on domestic wells in Fluttendorf were observed and the reduction of the nitrate concentration was higher than previously estimated. Under the hydrologic conditions given during the monitoring period the reduction is found to be around 50%.