Abstract: A water flow control system for regulating water traveling through an existing water supply line preferably includes a housing connected to an existing water line. A user interface may be coupled thereto and remotely attached. A mechanism may automatically prevent water from flowing through the housing upon detection of a triggering event. A controller may be situated within the housing along with motion sensors. A rotatable fan may be situated within the housing along with a plurality of tracks, triggers, and resilient spring members anchored to the triggers and tracks respectively. The rotation speed of the fan may be commensurate with the real-time water flow rate of the water flowing through the housing. A control logic algorithm operates to close a restrictor valve if the water flow rate exceeds limits set by the user interface. A manually-actuated lever may also be attached to open or close the restrictor valve.