The scope of this study was to develop Stormwater system for the City of Stillwater using GIS software and show the application of the same. The GIS map was successfully created which completes one of the necessary criteria for the Oklahoma Department of Environmental Quality Phase II Permit. It has stormwater system for the city for future reference and the outfalls along the creeks of Stillwater. This map can be used for source tracking, pollution prevention; planning during develop or re-development, and emergency management. The map will need to be keep updated as and when there are new developments in the city of Stillwater.