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Based on the results of monitoring data conducted by the Regional Environmental Management Agency (BPLHD) on 13 rivers that crossed the Jakarta area in 2010 showed that both river water and groundwater have high organic and inorganic pollutants. To cope with pollution, the environmental service periodically in the local city or regency government takes river water sampling at the waste disposal location to examine its water content. The location point for industrial waste disposal is not always easy to reach. Under certain conditions, officers must ride an assembled boat or walk down the river to access the location. Besides taking a long time, human safety factors are also a consideration. Based on these problems, in this study, a wireless sensor network was developed in an Unmanned Aerial Vehicle (UAV / drone) using 912 MHz radiofrequency. UAV in this study is equipped with various sensors to determine water quality, namely: PH, temperature/turbidity, Dissolved Oxygen (DO), and carbon dioxide. All sensors are integrated and monitored wirelessly using Universal Asynchronous Receiver Transmitter (UART) on the ground station. The telemetry system is designed to be able to send and receive data up to a distance of 1 KM in real-time. With a UAV created, monitoring of water quality can be done efficiently and more safely.