Innovative solutions and planning tools for safe drinking water supply and sustainable wastewater management are the focus of the TRUST project. In many prosperous regions of the world population and economic growth in combination with competing water demand often lead to water scarcity, i.e. higher abstraction than natural regeneration. TRUST tackles this challenge by combining satellite-based remote sensing techniques, microbiological and chemical monitoring and water balance modelling with decision support tools, water supply and wastewater management concepts and inclusive procedures for the conflict analysis of interests and goals. The focus area of the project is the Lurín catchment in Lima/Peru. In strong cooperation with local partners (Peruvian water authority, water company of Lima and communities in the upper and lower catchment area) the developed tools and concepts are implemented and tested for their transferability to other regions. The main findings so far include the development of innovative and integrative water supply, wastewater disposal, treatment and reuse concepts for the upper and lower catchment area. These concepts will be evaluated using SDG indicators, national standards and criteria determined through participatory processes involving local stakeholders. This will create concepts for access to safe drinking water and wastewater disposal that are tailored to local hydrological, geographical, social, cultural and political conditions.