Dead river is a concept that refers to rivers that are heavily polluted and unable to clean themselves, greatly affecting the lives of the community and socio-economic development in the river basin. Currently, three river basins have heavily polluted water environment including: Cau river, Nhue - Day river system, Dong Nai river. If there are no timely pollution treatment measures, in the future, water sources of these rivers cannot be used for production and daily life.