Urban water security is among the defining strategic challenges of our time. Climate instability, hydrological extremes, ageing infrastructure, emerging contaminants, energy pressures, ecosystem stress and uneven governance capacity all require integrated and forward-looking responses. The Pompeii Symposium will address these issues through an interdisciplinary perspective linking engineering, environmental science, resilience thinking, digital innovation and territorial intelligence. Particular emphasis will be placed on how good practice can be translated into operational and scalable approaches for cities and regions. The overall scientific narrative of the page should make clear that the event is not limited to technological discussion. It is equally concerned with governance, implementation, learning capacity, social relevance and the ability to connect science, institutions and communities.