Sidoarjo Mud Vulcano Disaster is a dangerous disaster that can pollute the environment. Mud eruption due to errors of petroleum drilling since 2006 until now and there are 13 villages impacted. The mud vulcano becomes dangerous because it contains oil and heavy metals that have a risk for the environment and public health. This study aim to evaluate content of heavy metals in groundwater that can cause adverse health effects. The method used in this study was analytical descriptive. Samples were taken by purposive sampling in 6 villages of impacted areas. Each of that, took five points of the well water as sample. It tested by Atomic Absorption Spectrophotometer, then compared to WHO & Minister of Health Standard for drinking water quality. The results of this study show that level of iron (Fe), Cadmium (Cd), Zeng (Zn), and Lead (Pb) were still meet the standard of drinking water quality. While Manganese (Mn) in 3 locations exceeds from drinking water quality standard (> 0.4 mg/l). The Manganese level which have exceed of the standard can be risk for neurological disorders, liver damage, and kidney. Therefore, appropriate tech- nology was required such as cascade aerator, bubble aerator, and waterfall aerator to reduce Mn concentration or using bioremediation technique. Furthermore, needs some research to identify the carcinogenic metals in water and the effect to population.