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Nowadays, the use of bacterial calcium carbonate precipitation (bio cementation) has become popular as a ground improvement technique for sandy soil. However, this technique was not too much applied to organic or peat soil. Siak is one of the districts in Riau which has a fairly large area of peat. Many problem occurs because of the peat during the construction of infrastructure in Siak. This study focused on bacterial calcium carbonate precipitation from sea bacterial (Bacillus Sp) and its effect on permeability in organic soil. A special injection system was prepared for inducing bacterial solution to the samples. The bacterial solution supplied to the samples by gravity for 7 days in specific molds designed for this work. Calcite precipitation was observed by monitoring pH value and measuring amount of calcium carbonate. Change in the permeability was measured before and after bio cementation. Through this research, calcium carbonate precipitation from sea bacterial (Bacillus Sp) hoped can improve engineering performance especially in reducing permeability aspect of organic or peat soil so this technique suitable and help reducing the problem in construction of infrastructure in Siak district