carried out to ascertain the quality of drinking water, mainly by determination of trace metals present due to their impact on human health. This study was carried out to evaluate the concentration of some trace heavy metals (Fe, Mn, Zn, Ni) in some selected water source samples from Bahir Dar city. An Atomic Absorption Spectrophotometer (AA500GC, USA) was used to determine the heavy metal concentrations. Fifteen (15) different water samples were analysed for iron(Fe), nickel(Ni), zinc(Zn) and Manganese(Mn) contents in both dry and wet season and their concentration levels compare with WHO specific maximum level for drinking water. Iron was found to be between 0.167 and 1.44mg/L in dry, 0.204 and 0.676 during wet, Nickel ranges from 0.005 to 0.596mg/L and 0.202 to 0.941mg/L in dry and wet respectively. The highest concentration of Zinc was 0.233 and 0.312mg/L in dry and wet respectively; Manganese was ND (Not Determined) in each season. Most of the concentration of the metals were considerably found to be above the limit permitted by WHO’s drinking water guidelines (WHO,2010). This is an indication of pollution hazards of analysed trace metals in drinking water sources of the study area which in turn have important human health implications. Therefore, this study recommends the concerning body and other responsible authorities to take appropriate corrective measures.