Norway's water utilities lose on average 30 % of valuable drinking water through leaks. Many municipalities are transitioning from a passive to an active leak control strategy to reduce these unnecessary losses by utilizing model-based leak localization approaches. These model-based methods find leaks by combining sensor data with hydraulic computer models. Initial results obtained from virtual data show that the Dual Model gives good results even with errors introduced in the model, which is a significant advantage for water utilities dealing with uncertainty. This paper aims to display the possibility of reducing the leak localization time using the recently developed Dual Model and test the model for the first time on actual measurement data.