One method is used to improve the process and provide to minimize solutions to improvement of the company's internal standards that are flawed or inappropriate and reduce the trend of increasing waste products so that it increases for each period using the Six Sigma method. Through the implementation of the DMAIC cycle (Determine, Measure, Improve, Analyze and Control) in Six Sigma, a problem can be clearly seen at the root of the problem and can be fixed structured. This research was carried out at PT. Tangerang RST, in the Waste Water Treatment section by analyzing the cost requirements for wastewater treatment for purposes, where there were several ineffective and efficient costs so that it could produce waste on the costs allocated for the operation of Wastewater Treatment during the year 2015 From the results of the research that has been carried out successfully found several root problems and several solutions have been set to overcome the problem of wasting operational costs of WWT. At the end of the study it was also issued which succeeded in reducing the operational costs of Wastewater Treatment by 360 million in the 6-month Phase of Time Control.

Keywords : Quality Control, Six Sigma, DMAIC, Waste Water Management.