T The region of DKI Jakarta, especially North Jakarta is an area that has a level ofpollution and environmental damage that is generally derived from industrialactivity, residential, offices, and community activities. Water is one of theimportant substances on earth that is needed for life and all types of living things.Groundwater is one of the important components in the hydrological cycle at thebottom of the surface (Sen., 2015). This research aims to determine the type ofgroundwater layer using the drill log correlation method in the study area,determine the characteristics of groundwater chemistry and determine the faciesor chemical types of groundwater in the Cilincing and surrounding areas. Thedatas used in this research are the result of analysis of the main elements ofgroundwater samples that have been taken at the study site. Analysis ofgroundwater characterstics is determined by the analysis method of Square PiperDiagram, while groundwater chemical facies analysis is carried out by piperdiagram analysis method. This type of aquifer is depressed aquifer and freeaquifer .The chemical characteristics of groundwater formed in the Cilincing areaare semi-bicarbonate groundwater types and sulfate groundwater types. With thechemical facies of groundwater formed are facies of sodium (Na⁺) + potassium(K⁺), chloride (Cl⁻) + sulfate (SO4²⁻), facies of calcium (Ca²⁺) + mangnesium(Mg2⁺), bicarbonate (HCO3⁻) , and facies of calcium (Ca²⁺) + mangnesium (Mg2⁺),chloride (Cl⁻) + culfate (SO4²⁻).