Water played and plays a primordial role throughout the history not only of life but also of the earth. Currently, even with the benefits of scientific and technological advances, it is still possible to verify large gaps in relation to the management of water resources, therefore, the need for investments in this area is increasingly evident. That said, it was initially sought to survey theoretical subsidies related to the hydrographic basin of Rio Una, located in the lakes region of the State of Rio de Janeiro. Subsequently, collections and analyzes were carried out in the Una Basin to verify the quality of its waters, reflecting the current situation of the River. The methodology and results of the initial stage of the research were obtained through literature review and in the final stage through the part practice, collection and analysis of primary and secondary data.

Keywords: Una River, Lagos Region and Water Resources Management.