Abstract: Systems and methods for monitoring a plumbing system. A sensor module includes an acoustic flow sensor, and is configured to be attached to a water pipe. In response to receiving sound at the acoustic flow sensor above a threshold level, the sensor module wakes up from a low-power sleep mode and begins collecting acoustic data. The acoustic data is analyzed to determine if water is flowing through the pipe, and if so, a thermal flow sensor may also be activated. Flow data is collected while the water is flowing to document the flow event. In response to the sensor module determining the flow of water has stopped, the collected data is transmitted to a remote server, and the sensor module returns to sleep mode. Multiple sensor modules can be deployed to form a sensor network that communicates wirelessly to monitor the plumbing system.