Which of the following does a facility operator need in order to optimize water consumption?

Submetering systems are the correct answer because they allow facility operators to measure water use by system, area, or end use. LEED Water Efficiency emphasizes not only reducing water demand but also tracking performance over time. Submeters help identify leaks, unusual consumption patterns, inefficient irrigation, cooling tower issues, process water use, or fixture problems. Occupant schedules and building operating times may help estimate water use, but they do not provide direct consumption data. Fixture cut sheets are useful during design and documentation because they show fixture performance, but they do not help operators optimize actual ongoing water use unless paired with measurement. Submetering supports continuous improvement, accountability, troubleshooting, and better management of potable and non-potable water resources.