World governance is not organized as a democratic regime. As such, we have to understand more precisely what is or can be the function of international law in that governance. Can it contribute to the democratization of global governance? This text will search an answer to this question through a concrete example, namely the process of recognition of the right to water, which has been recently integrated in the international public law system. After reminding the significant characteristics of that process of integration and the consequences at the international level but also in national legal systems, we will try to understand the relations between law and politics implied in that process. We will then discuss the meaning of these for the potential democratization of world governance.