T he research area is located in the Leuwinanggung area, Tapos sub-district and its surroundings, West Java Province. This research is based on the importance of knowing the chemical properties of groundwater in densely populated areas such as West Java. The objectives of this study are to understand the rock units of the study area, determine the pattern of MAT flow and groundwater flow and to determine the hydrochemicals of the research area. The method used is taking groundwater samples at each dug well, measuring the physical properties of groundwater and measuring the dug wells to make a MAT distribution map, as well as chemical analysis of the main ions of groundwater samples in the laboratory. Then analysis of anions and cations by entering ion values into Piper's Triliniear diagram. Chemically groundwater can be categorized as groundwater with chemical properties of Mg and HCO3 and Na and. HCO3.