Results are presented from a field study performed on the Ciliwung, Sunter and Krukut Rivers in Jakarta. The rivers are used as raw water sources for Jakarta municipal water supply systems, yet the rivers are used as receiving bodies by some inhabitants and industries. In this study, the quality of the rivers' water was determined using a Water Quality Index (WQI) which is scaled from zero to a hundred. The higher number of the WQI indicates, the better quality of the river water. Among the results presented are the WQI and heavy metals concentration. River water sampled from upstream of Jakarta, intake areas, and estuary areas were tested during the dry and rainy seasons. In the dry season the WQIs of Ciliwung, Sunter and Krukut Rivers ranged between 21-42, 20-29 and 21-38, respectively. In the rainy season the WQIs of Ciliwung, Sunter and Krukut Rivers ranged between 34-47, 32-50, and 34-47, respectively. The level of heavy metals did not exceed current Indonesian Standards. It was concluded that the overall water quality of the Ciliwung, Sunter, and Krukut Rivers was between very poor and poor, and the rivers were polluted by Cu, Pb, Cd, Zn and Hg.

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