This deliverable (D 5. 5) presents the standardization label proposal in the framework of the activities into Work Package 5 Promote interoperable solutions. The label proposal is structured in three facets that correspond to three criteria: INSPIRE conformity (environmental criteria), WFD conformity (legal criteria) and OGC conformity (geospatial criteria), applied to the standardization and interoperability topics. This presented label has eight possible options (graphically identified) that indicates the accomplishment of the three criteria and it represents a quality indicator for the products in the WaterInnEU marketplace in terms of standardization goals. Finally, this proposal poses three levels of potential application in the future.