Water monitoring system is a system than monitor the condition of water. This system monitors the water on several condition. The condition monitored by this system is turbidity value, total dissolved solid value and pH value. For turbidity, the higher the reading from the sensor, the higher the turbidity of the water. For pH value, if the value of the reading is more than 7, the water is in alkaline condition. If the value of reading is less than 7, the water is in acidic condition. In this project, this system is using Raspberry Pi 3 model B+ as its main controller. Several sensors are used such as turbidity sensor, total dissolved solid sensor and pH sensor. The reading from the sensor is then send to Raspberry Pi and the sensor value is send to the other devices through built-in Wi-Fi of Raspberry Pi.