The amount of water a urinal uses per day depends on its flush volume and how frequently it is used. On average, a standard urinal using a conventional flush system can consume around 3.8 to 11.4 liters per flush. If a urinal is used frequently throughout the day, it can potentially use several gallons or more. However, with water management systems in place, daily water usage can be significantly reduced, often by up to 80%, resulting in substantial water savings.