This article will: Discuss the importance of water efficiency and its drivers. Differentiate between water efficiency and water conservation. Explain the water efficiency credits in LEED BD+C and O+M projects intent, requirements and reference standards. Explore water efficiency strategies and technologies that could be implemented on Green Building projects for enhanced water efficiency in LEED Projects. Explain the water reduction calculations involved in LEED BD +C and O+M WE credits. Water specific case study for NC& EBOM projects respectively.