Currently, La Copa reservoir, located in the municipality of Toca, Boyacá, built in 1990 for the regulation of salts from the Chicamocha River and the damping of current systems in the rainy season, has been characterized in exploratory studies in 1993. by Ruiz and Camacho, and, in the same year, by the Food and Agriculture Organization of the United Nations FAO; for agri-food potential purposes in developing countries. Currently, the system has an important ecological function, not only due to its water absorption, but also because it is the main supplier of irrigation for the middle basin of the Chicamocha river. Consequently, the present study shows the importance of carrying out follow-up and monitoring in this type of water systems and relates the behavior information in terms of physical-chemical, biological and bacteriological variables. This report includes the results of an annual monitoring plan in the different periods of change in the water regime and the main sampling points defined in the recognition of the study area. The analysis of the trophic state is also included, based on the estimation of the NH4 ion; of the range proposed for the classification of lakes made by Vollenweider and the application of the ICOTRO index from the values ​​obtained for the PO4 ion, base information, to identify preventive management strategies on human activities carried out in the area of ​​direct and indirect influence of this important water resource, defining the importance of carrying out periodic studies that provide knowledge to avoid alteration and increase the useful life of this system. The knowledge of the physical-chemical, biological and bacteriological behavior of the reservoir, allows to establish elements of analysis regarding possible ecological alterations and to avoid or limit the degradation of the environment in case of negative impacts of the socioeconomic activities that are currently carried out in the reservoir the area of ​​influence of the water resource.