The Las Vegas Valley Water District (LVVWD) is developing an integrated system that includes a Supervisory Control and Data Acquisition (SCADA) system, a hydraulic and water quality model, a Geographic Information System (GIS), and other database systems. The SCADA system constantly observes and collects real-time changes in system hydraulics, water quality, and operations from various locations within the water distribution system. The data collected in the SCADA system is important for model calibration and validation. The model utilizes SCADA data to compute hydraulic and water quality results for operational adjustments, unexpected conditions, or what-if scenarios. The model also uses spatial data in GIS to update the model facilities. The GIS utilizes both SCADA data and model output, and plots information as a visual aid for system enhancement, operational planning, and decision support. The integrated system enables the data process to be automated to the maximum extent possible so that manpower and time are saved. This paper describes the significance of such integration and demonstrates its value with three example applications. Includes 2 references, figures.