Development of economic has impact by many industries operating along the river then create the pollution by industry waste as well as effected to river water. This research aims to develop a system to monitor river water quality in many parameters that safe for human as well as for ecosystem live in the river. Wireless Sensor Networks (WSNs) used in this design because of advantages WSNs system, a sensor node attached to many sensors such as water temperature, pH, dissolved oxygen (DO) and electricity conductivity. The river water monitoring system designed be able to monitor water level and flow rate for environmental and flooding alert. A sensor node customizes designed to fulfill water quality standard as well added others sensor for flooding alert, data collected by sensor node forward to WSNs sink node which embedded with a microcontroller unit and memory as local database before sending to backend system. Monitoring at backend system shows by some displays in order to easy monitoring by representative institution or local authority as well action will be taken if some case happen or abnormality reported by monitoring system. Prototype of WSNs node have been designed and tested, the results shows sensor node be able to detect polluted water parameter and water level as well flow rate. Furthermore, sensor node will be testing at actual site which is one of the river in Riau Province in Indonesia. © 2019 IEEE.