The project TransTourismus aims to support tourism communities in solving the challenges of wastewater management in a transdisciplinary framework. Together with various stakeholders from coastal tourism communities in the tropics, a holistic picture of tourism-related wastewater social-ecological impacts will be developed. The ultimate aim is to support decision-making and suggest solutions for wastewater management through a deliberative and participatory process. In workshops and field studies, chemical, biological, ecological, economic, and social indicators will be developed in a participatory way, taking into account different marine ecosystems as well as the different priorities of community members and tourists.