Decreasing water quality is a serious problem because water that has decreased in quality can no longer be used to meet water needs for humans. Recovery of water quality degradation takes quite a long time. The migration of seawater to land is one of the factors that can disrupt the quality of groundwater. In the research area, there has been a decrease in the groundwater level with saline water. The purpose of this study was to determine the delineation and depth of the saline water table in the study area. The method used in this study is the resistivity geoelectric method with the Wenner-Schlumberger configuration. Data acquisition using ARES geoelectric tools. Measurements were carried out with 3 passes. Data processing was carried out using RES2DINV and Voxler software with the results in the form of subsurface resistivity images. The results obtained from processing and interpretation are the resistivity values in the study area ranging from 0.16 to 19.8 ohm.m. In the 2-D subsurface resistivity cross-section, the distribution of saline groundwater below the surface is estimated to a depth of 43.6 meters with a resistivity value of 0.16-5.76 ohm.m. The resistivity value of 8.56-14.2 ohm.m was identified as sandy silt soil, and the resistivity value in the range of 17-19.8 ohm.m was a material of fine to medium sand, gravel, and clay. It could be concluded that saline water was suspected as a result of seawater intrusion. The amount of saline water content in the aquifer, where freshwater has been contaminated by saline water.
