Abstract: A universal fluid flow sensor system and method installable in a toilet tank. A system is disclosed that includes a two-part water flow monitoring device, which include a dry module that contains a power source, communications and an event processing system; and a wet module releasably coupled to the dry module that receives an inflow of water and includes a turbine with magnets that generates a magnetic field when spun. The magnetic field is captured by the dry module to determine flow rate data.