Groundwater is the main source of freshwater for use in agricultural, industrial, andrndrinking purposes in Ethiopia. Addis Ababa City gets more than 60 % of its water supplyrnfrom groundwater.rnWhen groundwater moves from surface to underground sources, it passes through a largernnumber of filtering media and hence becomes filtered. The resulting physical andrnchemical properties of groundwater are most importantly related to its relationship withrnthe media, which the water encountered, and its residence time. Assessments of therngroundwater quality to determine their spatial distribution have significant importance forrnfurther utilization and management of the resource.rnThis study was focused on selected five water quality parameters: Total Dissolved Solidsrn(TDS), Nitrates (NO3), Iron (Fe), manganese (Mn) and Fluoride (F). 108 samples fromrnwells that are located within Addis Ababa city were collected and analyzed to determinerntheir water quality. Their spatial distribution analysis carried out using ArcGIS and thernoverall Water Quality Index also computed.rnThe results of the laboratory analysis indicated that significant number of wells have arnwater quality that was above WHO drinking water guide line values. This study showedrnthat there are three kinds of water exists in Addis Ababa city: Groundwater with high ironrnand manganese at the northern part of the city, with high Fluoride and TDS in the centralrnpart of the city which extends to eastern direction of the city and groundwater with betterrnwater quality which complied with WHO permissible value at southern part of the City.