T The landslide that occurred at Kedungwaru Limestone Hill, Kebumen, CentralJava, resulted in damage to the road, dissolution the connection of the bridge areaabove and below hill, and disruption irrigation system of local resident. When itrains, rainwater flows from top to bottom of the hill through drainage. Rainwaterfrom drainage is channeled towards the fracture and empties into the river. Therainwater will seep into the ground and become groundwater. The presence ofwater in the soil will fill the space between the granules of the soil and will causethe soil to become saturated. If the soil is saturated, the pore pressure on the soilwill increase and will reduce the retaining force and result in a decrease in theslope safety factor. This is feared to result in aftershocks. The presence ofgroundwater can be determined using the resistivity geoelectric method. Resistivitygeoelectric utilizes the electrical properties of materials below the ground surface.The configuration used is Schlumberger configuration with 1D (Vertical ElectricalSounding) data retrieval method. Measurements were made at 4 measurementpoints with each stretch of electrode current varying between 50 - 89 meters. Theresults that will be obtained from geoelectric measurements are the presence of anaquifer. The groundwater level can be known from the free aquifer layer. Thepresence of ground water will reduce the value of security factors. Slope safetyfactor is calculated using the simplified Janbu method. Calculation of slope safetyfactors is calculated using Slide 6.0 software. The results obtained from thecalculation of slope safety factors are deterministic and probabilistic securityfactors. The value of the safety factor obtained from the cross section of thegeoelectric path shows a number above 1, in this condition the presence of groundwater has not caused landslides.