This dissertation aims to analyze in the municipal scope of Cachoeiras de Macacu, the social participation process of the Macacu River Depollution Monitoring Group, in front of public management, both in the formulation and in the implementation of public policies. The research carried out was of a qualitative nature and the methodological path that anchored it, was supported by documentary and bibliographic research, aiming to expand the knowledge both from the point of view of the legislation, as well as through the documents produced internally by the Group subject of the research , in order to understand the dynamics undertaken through the minutes of meetings, resolutions and other documents produced, which allowed us to identify which form they used to contribute to the dynamics of policy formulation in addition to other actions. The field research, initially carried out by direct observation, favored the identification of the Group s daily actions, which helped in the analyzes. A listening channel was also opened by conducting semi-structured interviews with the subjects involved, both from civil society and the government, which allowed for a better approximation of reality, as well as understanding various aspects developed by the Group based on the speeches. The set of instruments used contributed to the systematization of the data collected and the analysis of the speeches, allowing to draw a panorama composed of results and proposals arising from the action developed by the Group, revealing that the effectiveness of the participatory process requires a set of efforts to be performed both by society civil society regarding the subjects involved within public agencies in the development of democratic management. It is hoped that this research can contribute to strengthen other democratic practices so important to defend the rights of the population, including the right to participate directly in public administration, as well as expand knowledge through academic production that reveals important points of the citizen practice that seal civil society, in actions aimed at formulating public policies, which in this study, in particular, are also focused on socio-environmental issues.