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Inventory of GIS Web Applications for Environmental Roads, Drainage, and Septic Tanks is an information system built to support spatial requirements, where these applications are built to address the problem of investing spatial data in environmental roads, drainage, and septic tanks. In developing a web-based GIS application, it usually uses the methodology namely waterfall, but in this study, the application implementation uses the Y-Model Webgis Development(YWDM) which is a combination of web engineering and the context of GIS itself. This paper introduces an implementation to create an application by using Y-Model Web Geographic Information Systems (GIS) with a study case on inventorying spatial requirements on roads, drainage, and septic tanks.This methodology was implemented to create an application which needs a map visualization for city planning and development By using the YWDM methodology, the needs and accuracy of application development can be done, using several tools. The data process uses ArcGIS ESRI and PHP and JavaScript programming languages to visualize the results. The results show that application development is built more easily because requirements can be well defined because a collection of requirements from the context of software development and spatial specifications are met and the application is completed. When creating a GIS web application, some methodologies can be used besides waterfalls or ordinary SDLCs, because spatial requirements are not well defined. With the implementation of this methodology, it is proven that the development of GIS web applications can be easier, defined and by the needs desired by the user