The availability and sustainable management of water as well as safe sanitation for all are important goals of the United Nations' 2030 Agenda for Sustainable Development. But how is this to be achieved in a country like Peru, where water is scarce but more and more of it will be needed due to population growth and the economic boom? To this end, the TRUST project developed concepts that combine research and practical knowledge from the natural, engineering, and social sciences and involve those affected at the local and regional levels. The final report, which is now available, results in five theses and a total of 20 recommendations for water resources, water use, and water management.