High rainfall affects the intensity of ground water content. The lower of ground water content then the ground water pressure will be smaller, whereas if the ground water content is higher then the groundwater pressure will be greater. It affects the movement of the soil that can cause landslides. Based on the importance of ground water pressure detector equipment, ground water pressure and ground water pressure detectors are designed using Tensiometer, MPX5100DP Sensor, Hygrometer YL-69, DFRobot Leonardo, and Xbee S2C Sensor Hygrometer. The test method uses two types of methods for each parameter. The sensor readings are sent via Xbee to the PC server and displayed in web form. The design of ground water pressure and ground water content detectors were tested using sand medium. Error reading tensiometer data using MPX5100DP sensor is 7.8%, with data error limit ± 11.3%. While the minimum value of hygrometer sensor approach is 3.04% for soil conditions with 0% moisture content. The value of 3.04% is also an error reading value of ground water level detector. Data Loss for Ground Water Pressure and Ground Water Content Detectors occur for the use of delay 100 ms and 500 ms. The threshold limit before landslide warning for Groundwater Pressure is -9.36 kPa and for Ground Water Level is 21.3%