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Twenty three on-line water quality monitoring stations have been built along Brantas river in East Java. The construction of these online stations has been aimed at providing accurate, real-time, programmed, and continuous data on the quality of the Brantas river water, such that the occurrence of a certain level of water pollution can be detected on time. The placement of these twenty three stations, as well as the types of parameters detected by the sensors inside the stations, has been based on the characteristics of the river water at each location. With this, the source of water pollution can be detected more accurately. The measured parameters include pH, temperature, conductivity, dissolved oxygen, turbidity, orthophosphate, and ammonia. The ability and effectiveness of these on-line stations in detecting water pollution in the Brantas river will be printed in this paper.