This book provides the first comprehensive assessment of the various issues faced by countries in the European Union, where progressing climate change and urbanization pose significant cooperative challenges in a large number of river basins. Conducting a thorough analysis of the intricate web of EU water governance, it reveals that the hydropolitical stability of the European Union is already at risk. Further, given the structural nature of the shortcomings in EU water policy—e.g. the rigidity of the EU’s founding treaties or the institutional complacency of the European Commission—the book argues that these risks are likely to turn into sources of prolonged conflict, unless EU decision-making bodies take steps to address the new hydrological realities early on.