The ABC Waters Programme, with its design based on Water Sensitive Urban Design (WSUD), has successfully implemented stormwater control systems across Singapore for 15 years. Yet, there is relatively little attention paid to monitoring ABC Waters features' medium to long-term performance. The relatively limited monitoring efforts restrict the ability of public agencies and private developers to provide adequate maintenance for existing systems and to optimize the design of new systems. Compared with traditional monitoring equipment, low-cost sensors present economic advantages and flexibility for operation and communication, also, by allowing a large decentralized spatial monitoring, have a great potential in environmental monitoring. In this study, we aim to explore the potential of the low-cost sensor in monitoring work via testing its performance compared to the traditional sensor. And here presents the lab testing experiment for water level sensors.