Abstract: A sustainable drinking water system increasingly becomes a problem with an increase in population density. The purpose of this study is to assess the drinking water system in Juba city and compare its water quality parameters with the WHO standard. The systematic review method is applied to identify relevant information and the gray literature data collected from the Ministry of Water Resources on the treated water quality parameters such as water temperature, pH, water conductivity, TDS, and residual chlorine for January, March, June, and August 2018.