This presentation describes open data-based accountability initiatives in Dutch bilateral development aid, with a particular focus on water. Since January 2016, the Directorate-General for International Cooperation (DGIS) of the Netherlands Ministry of Foreign Affairs (MFA)DGIS requires all its aid recipients to comply with the reporting standards of the International Aid Transparency Initiative (IATI). Water-specific initiatives that DGIS supports include the Water Point Data Exchange (WPDx), WASH sustainability checks and water productivity monitoring through remote sensing (FAO / UNESCO-IHE). The presentation concludes that data alone is not a silver bullet and that partners and stakeholders need to become data savvy. Presented on 6 July 2016 by Kees Oude Lenferink (DGIS) at the IRC event: "Accountability tools to improve WASH service delivery", in The Hague, The Netherlands.