Action on environment and climate goals has received significant attention within the Eastern Partnership (EaP) initiative. As a specific regional dimension of the European Neighbourhood Policy, the EaP aims to strengthen and deepen the political and economic relations between the EU, its Member States and the six partner countries: Armenia, Azerbaijan, Belarus, Georgia; the Republic of Moldova and Ukraine. The EaP is also geared towards delivering on global commitments, including the Paris Agreement on Climate Change and the UN (UN SDGs) 2030 Agenda and its Sustainable Development Goals. In 2011, the EU initiated a project on SEIS implementation in EaP countries, which has seen two phases up to 2020. This demand-based project, implemented by the European Environment Agency (EEA), has supported EaP countries in accessing EU and European Environment Information and Observation Network (Eionet) knowledge and experience. Water was one of the priority thematic areas of cooperation. This report is one of the results of the implementation of Shared Environmental Information System (SEIS) principles in EaP countries. It presents a regional assessment of freshwater availability and wateruse efficiency based on seven selected United Nations Economic Commission for Europe (UNECE) water indicators chosen in agreement with the EaP countries.