The research presents the evaluation of the environmental impacts generated by the sewage discharge into the Guaca River in the area of a neighborhood named La Primavera which belongs to the municipality of San Andrés Colombia, through the Conesa method. In order to carry out the research, information was collected from government entities, and field visits, with the aim of developing an environmental baseline, that would allow an abroad acknowledgement of the municipality’s current conditions and the water source, analyzing the biotic, abiotic and social factors