The responsible management of water resources is essential for promoting sustainable development and supporting economic growth. To ensure long-term water security, society must adopt more conscious consumption practices aimed at preserving natural reserves. In this context, we present the development of an affordable computational system based on Internet of Things (IoT) technologies and Commercial Off-The-Shelf (COTS) components for the detection of water leakages in residential settings. The proposed system integrates modules for data acquisition, transmission, and processing, providing users with timely information on potential leakages. Our methodology includes empirical evaluation of the data transmission process and a comparative analysis of leakage detection techniques. A functional prototype was successfully implemented and tested in a real-world environment, representing a tangible step toward a more sustainable and water-efficient future.