Background: Clean water supply can be obtained from various sources, both groundwater and surface water. Groundwater often contains high levels of iron (Fe). Many residents are forced to use water which in terms of quality does not meet the requirements, one of which is the chemical elements in the form of high iron content which can cause diarrhea, anemia, kidney damage that ends in death. Methods: This research is an experimental study to determine the effectiveness of bagasse activated carbon thickness in reducing iron (fe) levels in groundwater in Kebon Jeruk district, west Jakarta. This research was conducted at the workshop of environmental health department of health polytechnic of the ministry of health Jakarta. The water sample used was 45 liters, samples from electric pump wells treated with sugarcane bagasse activated carbon filtration with a thickness variation of 0 cm as control or without activated carbon bagasse, 30 cm, 45 cm, 60 cm, and 75 cm. Result: results of chemistry laboratory research at the department of environmental health polytechnic of the ministry of health Jakarta on the content of iron (fe) in groundwater, iron content (fe) before processing by filtration method using bagasse pulp activated carbon as much as 2.99 mg / l against allowable iron (fe) levels for clean water quality requirements based on ministry of health regulation no. 32 in 2017, the maximum allowable content of 1.0 mg / l. Conclusion: of the five treatments the most effective thickness of activated carbon reduces iron (fe), is at a thickness of 45 cm because it has been able to reduce iron levels below the maximum allowable level based on ministry of health regulation no. 32 in 2017 which is 1.0 mg / l. Keyword: Water Treatment, Sugar Cane Bagasse, Fe Reduction, Environmental Health, Environmental Chemistry