In modern society, developmental project initiatives and implantations are critical issues to the community. However, most projects are implemented without stakeholders input, particularly the host community. The purpose of this study was to investigate the determinants of community participation in the implementation of development projects a case of Garissa Sewerage Project. Four research questions were formulated to guide the study. The study employed a descriptive survey research design. The sample comprised of 138 respondents. Data were collected through questionnaire and interview guide. Findings revealed that locals were unaware about the project. The locals were of the opinion that the development projects undertaken in their locality had not been implemented through their participation at initial stage in decision making, planning and implementation. The local members agreed that the project was run by people from other areas. Findings also revealed that there were social factors that affected community participation i.e. education level at a high extent. Findings further showed that the locals' attitudes, managerial involvement influenced their participation on project.