The objective of this study was to apply BMWPVIET index in order to assess water quality in Hau River. The study was conducted 2 times in the rainy season and 2 times in the dry season (2013- 2014). A total of 36 sites were collected consisting of 14 sites in the main rivers and 22 sites in the tributaries. The results showed that total of 66 Macroinvertebrates families was recorded in the study area. Based on distribution characteristics, habitats and taxa tolerance values, 24 families of the found macroinvertebrates have been supplemented and adjusted into the BMWPVIET system which can be applied specifically to conditions of the Hau river basin. There was relatively high coincidence (87%) about the level of water pollution in Hau river when water quality was evaluated by using biological, chemical and physical methods.