Water efficiency is a cornerstone of green building certification. Certified buildings must meet rigorous standards, including the use of water-efficient fixtures and water recycling systems. By integrating rainwater harvesting and greywater reuse into their designs, green-certified buildings minimize water wastage and optimize resource use. These measures not only reduce operational costs but also support sustainable water management practices. Green building certification is essential for creating eco-friendly environments that prioritize water conservation for future generations.