Water use is a significant operational cost factor for large swimming pool facilities, however it has been overshadowed by the recent focus on energy consumption and carbon emissions. Currently, it is difficult for operators to make decisions in relation to water efficiency due to the lack of information about the relationship between pool operation and water use. This study has started to address this issue by reviewing water use at a fully operational facility. The analysis of the consumption data has led to a proposal for a new water performance indicator, the water exchange deficit. Modifications to the method of estimating water consumption have also been proposed to enable enhanced water management guidance to be developed.