In smart water management using IoT, IoT gateways play a major role. These gateways collect data from various sensors installed in pipelines, tanks, or treatment plants. The collected data is processed at the edge, meaning close to the source, to reduce delays. Only essential information—like leak detection, water quality, or tank levels—is sent to cloud dashboards. This setup reduces bandwidth costs and makes real-time decision-making possible. IoT gateways are essential for smart water meters and IoT tank level monitoring systems. They make water resource management smarter and more reliable.