This research aims to develop a web-based Environmental Drainage Monitoring Information System, which is designed to enhance drainage data management in the city of Surakarta. In this study, we utilize the PHP programming language and the CodeIgniter 3 framework, along with the Leaflet library to visualize data in map format. The development methodology employed in this research is the System Development Life Cycle (SDLC) with a black box approach for testing. Test results demonstrate that the system successfully fulfills the expected functional requirements. Features such as drainage data management, data retrieval, data analysis, and drainage mapping operate effectively and are accessible to Administrators, Sub-districts, Villages, and the Community. In conclusion, the developed Environmental Drainage Monitoring Information System effectively achieves its intended objectives. The system significantly contributes to improving drainage data management and facilitates data access for stakeholders. However, for future enhancements, attention should be given to system limitations related to real-time monitoring and predictive drainage conditions. It is anticipated that this system will assist in making more informed
decisions to maintain the sustainability of the environment in the city of Surakarta.