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Ground water is one of the most important resources that support human life. The use of groundwater increase because of many factors, such as good quality, low cost and easy retrieval. Wonosobo is a rain catchment area on Java island. Development and population growth has lead clean water demand in Wonosobo District. The percentage of population growth in Wonosobo district is 0.48% with the total population at the end of 2017 are 784,091 peoples, to fulfill these needs, people in this area are use ground water. Free groundwater is very susceptible to pollution due to its superficial influence and human activity. Because of that, it requires an assessment of the groundwater vulnerability and risk of contaminant. It was analyzed by DRASTIC method. The DRASTIC method is applied by using weighted of some parameters, i.e.: groundwater Depth (D), amount of Recharge (R), Aquifer type (A), Soil type (S), topography (T), Impact of unsatuated zone (I), and hydraulic Conductivity (C, that are combined with overlay using ArcGIS. DRASTIC Index (DI) results in three vulnerability levels which are low, medium and high vulnerable of contaminants.