Water quality is crucial for health and the environment, and an IoT gateway plays a key role in real-time monitoring. It connects water quality sensors that measure pH, turbidity, temperature, and dissolved oxygen levels. The IoT gateway transmits this data to cloud-based platforms, enabling authorities to detect contamination and take immediate action. It supports remote monitoring, ensuring clean water availability in urban and rural areas. With its edge computing capabilities, an IoT gateway processes data locally, reducing latency and improving response times. This technology is essential for smart water treatment plants and sustainable resource management.