Embodiments of the present inventive concept include retrofit compliance apparatus, which can include a catch basin or drip tray. The retrofit compliance apparatus can be used in conjunction with a hand hygiene dispenser, and monitor for compliant usage of the dispenser. The retrofit compliance apparatus can include one or more microcontrollers and one or more sensors. The retrofit compliance apparatus can detect whether the dispenser has been properly used. The retrofit compliance apparatus can collect data allowing the determination of the identity of who used the dispenser. Historical information about valid dispense counts and invalid dispense counts for each individual user can be maintained by a remote server.