The second transnational conference of the WaterCost project as part of the Intereg North Sea Region focused on the issue of cost-effectiveness analysis and how it to apply it to groundwater and water supply issues. Benjamin Görlach gave a presentation on the role of cost- benefit considerations in the implementation process of the Water Framework Directive. He concluded that since there is only patchy data on costs and benefits, and elaborated on the role of the AquaMoney project in addressing this gap.