Floods tend not to be bounded by geopolitical or administrative borders, and involve various sectors in society. Flood risk must thus be jointly governed by a web of actors (Renn, 2008), who are not independent of each other but dependent on various resources and affected by the decisions and actions others are making (Becker, 2014). The patterns of social relations among these actors are therefore fundamental for society’s capacity to reduce risk (Ingold et al., 2010). Applying social network analysis on the interactions among formal actors contributing to mitigate urban flood risk in Lomma (Sweden), spanning Höje River catchment area, illuminates a clear rift between the hydrological system behind floods and the social organization of formal actors contributing to mitigate flood risk. This enviro-organizational rift must be bridged for society’s flood risk governance to be better adapted to address the expected escalation of flood risk in a changing climate.