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Siak River is one of four major rivers in Riau Province with a depth of 20-30 m, is a water transportation route, a source of raw water for drinking water companies, household needs for the community, wood processing industry, and fishery activities. This study aims to determine the condition of water quality and water quality status in Hulu Sungai Siak. The study was conducted in May 2017, with three observations at 3 stations. Determination of water quality status of Siak River is based on physical and chemical parameters of waters, using STORET method and Class III water quality standard as its comparator. The results showed that the status of Upper Siak River quality can be categorized as medium contamination. At Station I obtained a total score of -22, Station II obtained a total score of -22 and Station III obtained a total score of -20. The overall status of waters upstream of Siak River is classified in medium class (medium) or medium contaminated with score 11 s / d -30.

Quality Status of Siak River of Silver Part in Riau Province, Indonesia