Water is one of the natural resources that has a very important function for human life, as well as for advancing general welfare, so that water is the basic capital and the main factor of development. After the eruption in the Mount Sinabung area, the supply of healthy water was inadequate both in terms of quantity and quality, even though the Karo Regency government made efforts to provide this healthy water. For this reason, an appropriate technology is needed in post-eruption water treatment in the area of Mount Sinabung so that it can become healthy water and be used by the local community. The purpose of this research is to provide information about Groundwater Conservation Technology in Facing Climate Change in the Disaster Areas of North Sumatra. The method used is quantitative with purposive sampling technique by selecting 6 wells from 348 wells around Mount Sinabung. Chemical parameters for sampling each-each 1 liter of water to be put in bottles that have previously been cleaned and rinsed with distilled water first, then dried. Then examined by Laboratory Test. There is a simple technology in the form of a water filter made from a mixture of sand, activated carbon and dried starfruit leaves which can neutralize contamination of substances such as sulfur and others in the water so as to obtain healthy water suitable for use for the people in the disaster area.