In the past years, the Philippines recorded different disasters in diverse parts of the archipelago. The most frequent natural disasters were floods and storms that bring hazards to the people. The country has high level of exposure to hydro-meteorological hazards due to its geography. Because of the frequency, intensity, and variability of the hazards the government is compelled to adopt disaster risk reduction and management and climate change adaptation. In this study, we developed a web-based application for Relief and Casualty Monitoring and Early Warning System for Local Government Units in the Philippines tested in two case sites in the Philippines. Results show that the requirements set by the user were met. The overall evaluation shows that the system is useful in addressing some of the findings of the commission on audit assessment report in helping the local government unit in the Philippines in early warning for its constituents.