River water pollution is one of the common problems the community faces, which requires immediate handling with a public policy. Collaborative governance, a concept in public administration, can be applied to solve the problem. This research was descriptive research with a qualitative approach conducted in Belantikan Raya District in Indonesia. Belantikan River was chosen because water quality monitoring showed that this river had the worst water quality than other rivers. The water was moderately polluted. Various activities, including large private plantations, forest logging concessions, mining companies, and illegal gold mining activities, are found along the river. The data were obtained from informants, events, and documents through interviews, observations, and document searches. The data were then analyzed using an Interactive Model from Miles and Huberman. The collaborative governance in controlling river water pollution in Belantikan Raya District is the regional government’s effort to prevent river water pollution in collaboration with the private sector and the community according to their respective authorities, roles, and responsibilities. However, it is proven that the river water pollution control has not been collaboratively executed by the three parties (the regional government, the private sector, and the community).