<![CDATA[Indonesia has facing global challenges related to water issues, such as clean water scarcity, unequal access to services, and suboptimal infrastructure development. Collaborative efforts by institutions, community, and the government are needed to increase awareness and knowledge of wastewater treatment to produce water quality that meets quality standards. PT BCD, a wastewater treatment service provider, prioritizes water quality to meet customer satisfaction. This study aims to analyze continuous improvement efforts for management in resolving water treatment quality issues to achieve maximum production efficiency and profit. This study is quantitative and qualitative using the Six Sigma method using the DMAI (Define, Measure, Analyze, and Improve) framework for the period of August and September 2025. The analysis results show that the sigma value of water quality in August and September 2025 is 2.88 and 2.78 of the expected 6 sigma (zero defect) value. The sigma value affects revenue due to defect costs or Cost of Poor Quality by >40%. Fishbone diagram analysis identified eight categories of critical factors causing defects: machine, method, human, communication, material, regulatory/legal, technological, and environmental factors. Improvement proposals were generated through an impact-effort matrix analysis to determine the most prioritized actions based on impact and ease of implementation.]]>
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