Indonesia is one of the countries with high exposure to natural hazards, frequent disaster events, and a highly vulnerable population. Hence, risk communication and disaster information dissemination are crucial to reducing risks. Numerous disaster mobile applications (apps) with location-based services or maps already exist for facilitating risk communication to the public; however, availability does not automatically translate into use or adoption. Therefore, to understand factors influencing the adoption of a map-based disaster application, this study examined factors that affect the adoption of a local government-initiated map-based disaster application in Indonesia, namely Sistem Informasi Kebencanaan Kabupaten Magelang or Disaster Information System of Magelang Regency (SIKK Magelang) through the theoretical lenses of a combined information system (IS) success model. Partial Least Squared – Structural Equation Modelling (PLS-SEM), with the help of Smart-PLS, was used to examine the hypothesized relationships among the proposed constructs. A questionnaire survey with an application trial was conducted in Magelang Regency for the data collection. The study results confirmed the applicability of the combined IS success model frameworks in predicting the adoption of a map-based disaster app by the public. Although new constructs representing disaster-related and familiarity with online maps were initially proposed in the contextual model, the model validation results showed that intention to use SIKK Magelang was significantly influenced only by perceived usefulness and user satisfaction. Practically, this study guides the local emergency managers in Indonesia, especially Magelang Regency, to develop strategies to increase the applications’ adoption.