World Journal of Social Sciences and Humanities, 2017; 3 (1) 15-25Water governance is becoming imperative because of increasing water shortage for different uses in the world. However, the concept is not explored sufficiently in developing countries like Tanzania. This paper examines water governance in the lines of governance structures and institutions in the Southern Agricultural Growth Corridor of Tanzania. The paper adopted descriptive cross-sectional research design to make sense of the existing situation. Data were collected using quantitative and qualitative methods. A sample size of 270 water users was involved in the survey. Focus group discussions and key informant interviews were used to collect qualitative data. Quantitative data were summarized using SPSS while qualitative data were subjected to content analysis. The results showed presence of weak water governance structures and institutions that cannot influence water users’ behaviour. The basin level was unable to control and monitor water quality because of lacking human resource and adequate funding. The formal and informal institutions were interlinked in their operations. However, village governments and village water committees were unable to resolve water conflicts because of being colluded by those who breached the rules. Therefore, concerted efforts are needed to build capacity of the governance structures to enforce institutions in governing water resource.