Increasing the awareness of water quality and the concentration of disinfectants variability with distance is needed to prevent the customers from water born disease. This study was conducted to assess the spatial variations in the concentration of water disinfectants in the distribution system of Bahir Dar city, from Koteta reservoir up to the end of kebele 9. Totally, 385 water samples were taken, 15 samples from reservoir and 370 samples from residences, in the dry and rainy seasons from March 10/2014E.C upto August 27/2014.The data were collected by selecting the sampling site purposively. Combined chlorine, residual chlorine, pH, Temperature and Turbidity of the samples were analyzed by using excel and SPSS version 25 and then compared with the standards of the parameters in WHO and Ethiopian water quality standards. The results showed residual chlorine of 0.01 to 2.1 mg/L, combined chlorine of 0 to 0.2 mg/L, temperature between 21 and 25.8 ºC, pH of 6.7 to 7.56 and turbidity of 0.8 to 17.4 NTU. The concentration of the residual chorine was found very high in the villages near the reservoir while it was below the standard at points far from the reservoir. Since the pH of the water was around the neutral condition, only a very minimum concentration of Monochloramine was observed. The results generally show that significant amount of drinking water in the study area was not properly disinfected. Key words: Bahir Dar, Disinfectant, Monochloramine, Residual chlorine, Water Quality