Across the world, especially in developing regions, septic tanks lead to frequent overflows, environmental contamination, and public health hazards. With over 44% of global wastewater discharged untreated, there is an urgent need for innovative, real-time monitoring solutions that can proactively manage sanitation infrastructure, reduce health risks, and promote sustainable urban living. To address the global challenge of unmanaged septic tank overflows, we propose a smart septic tank monitoring system that uses IoT technology to provide real-time data, predictive alerts, and weather-integrated insights. By leveraging sensors, mobile applications, and cloud-based analytics, this solution empowers users to take preventive action, enhances maintenance efficiency, and supports safer sanitation practices, particularly in underserved and flood-prone communities worldwide.