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The increasing population up to 1.67% per year in the urban coastal city such as Semarang affects enormous stress on the natural resources – groundwater, in particular. To assess groundwater vulnerability to contamination the DRASTIC method was applied. DRASTIC was one method in compiling a zone of groundwater vulnerability to contamination. This method required seven parameters, namely D (water table depth), R (recharge zone), A (media aquifer), S (soil media), T (topography), I (vadose zone), and C (hydraulic conductivity). Processing of each parameter was developed by using spatial analysis in ArcGIS. The results conduct there are three level of groundwater vulnerability to contamination namely low, medium and high.