At basin, national or transboundary level, easy access to information on the status of water resources and uses is one of the keys to successful water policy implementation. The necessary data and information are usually fragmented, incomplete and/or heterogeneous, and accessing them is often difficult to organize for inconsistency of data and information. The lecture will cover how to process and exploit water-related data in an effective way. The course aims at providing the students with some basic principles of implementation of water information systems. It also aims at providing the students with a truly inter-disciplinary perspective on existing case studies in EU countries. At the end, it will be underlined some perspectives for development and innovation in water sector in the coming years.