The ZeroPollution4Water Cluster Workshop aims at connecting policymakers and project stakeholders for collaborative dialogue and knowledge sharing. The workshop explores the intersection of policy development and project practises from the experience of the case studies of the ZP4Water Cluster sister projects. The event features the Inventory of the case studies from ZP4Water Cluster sister projects, offering insights into effective strategies and the first Policy Brief of the Cluster on “Preventing groundwater contamination and securing drinking water quality”.