The interests of ozonation has increased significantly in recent years and today the ozonation is used in other steps in the drinking water treatment process. Ozonation has been used in the refill drinking water depot in the region of Indonesia for several years as disinfection at the end of the drinking water treatment process. Except for the disinfection, ozone has other benefits such as oxidation of iron and manganese, micro flocculation, reduction of taste and odour and it is also effective to reduce the water colour. The micro flocculation leads to the fact that less or no coagulants need to be used in the process. This study started with a lab scale experiments on ozonation and filtration of raw drinking water taken from shallow well followed by examination in the pilot plant. Research result showed the removal efficiency for organics, iron, manganese, and turbidity is up to 75 %; 98 %; 85 %; and 98 % respectively. All the parameter is comply with the drinking water standard regulated by Indonesia Ministry of Health No. 492/Menkes/PER/IV/2010. Disinfection capability of ozone against microorganisms will be reported in the full paper.