This work is a preliminary diagnosis of the actual state of the high-mountain water sources located in the Juan Cojo’s and El Salado’s basins of the NE side of the Aburra valley; both belong to the Girardota municipality (6o 20.951' N, 75o 27.199' W), between 1900 and 2500 meter above sea level, in the central mountain chain. In order to achieve this work, several samples were taken in august 10, 11, 17 and 19 of 2004. This preliminary study includes the physicochemical and mirobiological evaluation of 30 sampling points. Just one of the 30 sampling points exhibited absence of microbiological pollution due to fecal and total coliforms. This fact suggests bad practices in the final disposal of domestic and farming water residuals. In the other hand, the physicochemical and the ICA (water quality index) evaluation reveal that the sampled water sources exhibit typical characteristics of common low-mountain, non-polluted water sources. In other words, although pollution levels found in those water sources are not alarming, they do not exhibit the typical pollution levels found in natural high-mountain waters, as they should; even we could find some sampling points with meso-eutrophic conditions.