A quality control process has been applied to improve the water quality in the network of Sharjah city in the United Arab Emirates. The process capability of the network is measured in terms of pH and residual chlorine using the 6-sigma method. The sources of problems in this network are investigated and identified and corrective and preventive actions for each type of quality nonconformity are suggested. A geographic information system (GIS) is utilized to enhance managerial skills in supervising and improving the system. GIS maps allow remote and instantaneous monitoring of water quality in the network based on laboratory tests. Water quality in 38 locations of Sharjah city are classified according to their sources and located on GIS maps. Nonconformities are also classified according to their severity and located on the same maps to identify problematic areas. The Al-Nahda sampling point is selected as a sample location to test the process. The research showed that real time data gathered from different locations and embedded on GIS maps would provide an effective and immediate decision tool for technical managers in monitoring and improving the system.