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Electrocoagulation is a method that has a great ability on various wastewater and leachate treatment. It has a potential in removing various pollutants such as chemical oxygen demand, turbidity, ammonia, color, and suspended solid. The effectiveness of electrocoagulation method depends on several factors such as electrode, current density, operation time and pH. The aim of this paper is to review the relevant literature that publishes from 2000 to 2015 on the factor that influence Electrocoagulation (EC). The review describes, discussing and compare the factors that influence the EC process in various wastewater and leachate treatment