Small and Medium Enterprises metal smelting in Tegal has been existed since more than 50 years ago. This metal smelting process produces heavy metal waste such as zinc, iron, aluminum and copper which exceed the limit and contaminate the water. These hazardous and toxic wastes are disposed directly into the environment without adequate treatment to remove harmful compounds, thus alleged to have a high level of pollution to groundwater and surface water. The aim of the study is to obtain geological and hydrogeological condition of the study area, so that would be obtained the groundwater impurity pattern in the study area. In addition, this study also aims to determine the quality of groundwater based on physical and chemical characteristics of groundwater, determine the effect on the quality of groundwater contamination, and also to predict the extent to which contaminants have spread. The method used in this study was done by geological mapping, hydrogeological mapping, geoelectric survey and lab test results. The result of the study is to create hydrogeological modelling that could be used to determine the extent of groundwater contamination and also to predict how it will affect the pollution in the surrounding area within the next few years.