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Tanjung Jabung Timur Regency is a coastal area with peat water as clean water to meet daily needs. Peat water is not treated in advance by residents. This area is also a producer of marine resources in the form of shrimp which is a commodity in coastal regions. Shrimp are only used for meat, while shrimp shells, tails, heads become waste. Shrimp shell waste (chitosan) contains protein (25% - 40%), calcium carbonate (45% - 50%), and chitin (15% - 20%), but the magnitude of the component content depends on the type of shrimp. The purpose of this study is to utilize shrimp shells into alternative coagulants and determine the optimum dose of chitosan in reducing parameters in peat water. Shrimp shell waste (chitosan) into powder, then chitosan powder is used to treat peat water and determine the optimum dose of shrimp shell powder in reducing peat water parameters. The parameters tested were pH, color, iron, organic matter. The efficiency of shrimp shell waste powder in reducing peat water parameters. Variation of shrimp shell waste dosage (chitosan) at a dose of 100 mg / l, 200 mg / l, 400 mg / l and 500 mg / l. The results showed that the optimum dose of shrimp shells (chitosan) at a dose of 400 mg / l acidity degree (pH) efficiency could increase up to 75.00%, at a dose of 100 mg / l, the color parameter was able to reduce 49.52%, the iron parameter (Fe) able to reduce 90.20%, and settings of organic matter (KMnO4) reduce 73.49%.