Washroom monitoring system

A monitoring system comprising:

• a plurality of dispensers each configured to be located in a washroom and dispense a respective consumable hygiene product through a dispense cycle, wherein each of the dispensers is associated with a water source device;
• a water flow measurement device configured to measure water flow to the water source devices;
• and
• a data processing apparatus configured to receive indications of dispense cycles from the dispensers, to receive a water flow measurement from the water flow measurement device and determine which water source device was active by associating one of the water source devices with one of the dispensers based on a first time of the dispense cycle of the one of the dispensers and a second time of the water flow measurement, and
• wherein associating one of the water source devices with one of the dispensers based on a first time of the dispenser cycle of the one of the dispensers and a second time of the water flow measurement comprises comparing the first time to the second time.