The exploitation of groundwater on the northern slope of Mount Lawu, Ngawi, East Java, Indonesia is increasing due to agricultural use. To maintain the existence and sustainability of groundwater, the first step is to know the groundwater occurrence in the area. The objective of this study is to analyze the groundwater occurrence in the study area, the groundwater flow pattern, and the physicochemical properties of groundwater such as pH, Temperature, Total Dissolved Solids (TDS), and Electrical Conductivity (EC). The research methodology involved field hydrogeological observation and analysis of data processing using the Geographic Information System (GIS). Hydrogeological observation activities involve direct observation and measurement of 4 springs, 14 deep wells, and 42 dug wells located on the northern slope of Mount Lawu. The result of this research indicates that in both shallow and deep groundwater, the pattern and groundwater flow direction are from south to north and then parallel to the flow of the Bengawan Solo River. The physicochemical characteristics of the deep well water show similarities to those of the dug well water. Based on the findings, the groundwater system in the research area can be presumably developed by only a single groundwater system or two interconnected groundwater systems.