Water, a complex and multidisciplinary object, serves as an entry point that is a priori compatible and aligns closely with the perspectives opened by the approach of economics and sociology of conventions (EC/SC or convention theory). Water is an “object” which is at the intersection of stakeholder and governance issues in its multiple dimensions: water as a resource, as a service, and as an object of conflict and public policy. Studies examining the relationship between EC/SC and water address some of the key questions raised by EC/SC, though many others remain unanswered. These studies mobilize core EC/SC concepts as qualification and quality, thus contributing to stimulating debates on significant issues such as the links with the environment within the framework of the green world discourse. However, in most cases, these approaches are primarily used as a lens to interpret water conflicts without questioning the foundational forms of legitimation, thus missing the political dimension of EC/SC. The introduction of a plurality of “orders of worth,” as introduced by convention theory, and the reference to the concept of the “test of worth” partially enables moving beyond work that predominantly focuses on conflicts of water use.