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Hardware and verification must work together. Proven, third-party labeled fixtures and efficient appliances deliver predictable performance; submittal checks ensure installed models match calculation assumptions. Building-level meters plus domestic hot water sub-meters reveal leaks, failed valves, and abnormal base loads early, while interval logging and alarms flag issues outside occupied hours. This infrastructure supports commissioning and long-term optimization, aligning documentation with measured reality. Monthly bills are too coarse to isolate end uses or pinpoint leaks quickly, and occupant complaints arrive late. Sensors can aid hygiene, but without metering they don’t confirm savings and can even increase run time if poorly tuned. The combined specification, QA/QC, and metering approach yields durable reductions, lower utility costs, and a clean, auditable record for LEED water credits and ongoing operations.