Due to human activities such as batik home industries, abattoirs, and tanneries, the existence of heavy metals in dug-well water has been known as the cause of groundwater pollution in Yogyakarta City. To treat this dug-well water, a batch adsorption experiment by utilizing the activated zeolite and bentonite was carried out. Prior to the treatment, the zeolite and bentonite were characterized by means of XRD, SEM, XRF, and various ICP and modified to improve their CECs by thermal activation process, whereas the dug-well water was initially analyzed for certain heavy metals like Cd, Cu, Fe, Zn, Pb by AAS. In the course of treatment, the activated zeolite and bentonite powders at the same amount of 1g, 2g, 4g, 8g, and 15 g were separately put into the natural dug-well water sample of 250 ml; all the solutions were afterwards mixed by magnetic stirrer and kept for 24 hours to reach the equilibrium condition.The results showed that the activated zeolite which contains Ca-clinoptilolite and bentonite which mostly consists of Ca-montmorillonite are potential adsorbents with the selectivity series as Pb>Cu>Zn>Fe>Cd if the metals in their contents are not taken into account. In contrast, if considered, they polluted the dug-well water.