The water quality of Kitabog River at Kitabog Titay, Zamboanga Sibugay was assessed using macroinvertebrates. A total of 11 species of macroinvertebrates were identified in the study area. Phylum arthropoda has the number of 6 species and Gerris marginatus was the most abundant (32). One-Way ANOVA revealed that there were highly significant between species abundance and station (p=0.00 < .05). The Biological Monitoring Working Party (BMWP) Score System revealed that Kitabog River was under questionable category. The catergory interprets that the river is moderately impacted. The quality of water in the study site is brought by the waste matter being deposited into the river from the rubber plantation.