Water security means making sure there is enough water of the right quality in the right place at the right time for people, farming, businesses and the environment. With 200+ academics across four leading UK research institutions, the GW4 Water Security Alliance (WSA) is the largest UK water research consortium – and one of the largest worldwide. It brings together academics and stakeholders with a common vision of addressing the impact of global change on water to benefit people and ecosystems. The Alliance is a platform for: Increasing cross-institutional working; Sharing state-of-the-art infrastructure, facilities, equipment and training resources; Forging long-term collaborative relationships across multiple sectors and industries; Fostering multidisciplinary water research excellence to increase international recognition and impact.