We utilized an interpolation technique of
ordinary kriging for generating thematic map of each parameter. The final map indicates that the groundwater quality esaeicni from
North to South and from West to East of the study area. The areas located in Center, South and South West of the study area have
the optimum quality for drinking purposes which are the best locations to drill wells for supplying water demands of Tabriz city. In
critical conditions, the groundwater quality map as a result of this research can be taken into account by East Azerbaijan Regional
Water Company as decision support system to drill new wells or selecting existing wells to supply drinking water to Tabriz city.