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This research aimed to optimize the continuous monitoring of residual chlorine in the Potable Water System (PWS) managed by the Water and Sanitation Management Board (JASS) of the Sinsicap district, through the implementation of a low-cost technology, thus contributing to Sustainable Development Goal 6 (SDG 6). The study was developed using an applied approach, with an experimental design and explanatory scope. A prototype was designed and validated, consisting of an I2C/UART chlorine sensor, a PCB board, an SD module, and an LCD screen, programmed to record automatic readings three times a day at four points in the distribution network. The data obtained were analyzed using SPSS software, applying one-sample t-tests and calibration correlations. The results showed a significant correlation (R² = 0.983; p < 0.004), ensuring compliance with the sanitary standard (0.5-1.5 mg/L). Furthermore, the system achieved 95% availability and cost savings of 90.83% compared to commercial equipment. It is concluded that the developed technology improves the efficiency, accuracy, and sustainability of chlorine monitoring, representing a viable and replicable alternative for the country’s Water and Sanitation Management Boards (JASS).