LEED AP with Operations and Maintenance (O+M ) Practice Exam

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If an entire plumbing system was completed after 1994, what baseline water use percentage is needed?

100%
110%
120%
130%

The correct answer is: 120%

The correct baseline water use percentage for plumbing systems completed after 1994 is 120%. This percentage reflects the updated standards for water efficiency that have been developed over the years. The reference point for this percentage is based on the plumbing fixture and fitting standards established by the Energy Policy Act of 1992, which aimed to reduce water consumption in buildings. Understanding the rationale behind the baseline percentage is crucial. Plumbing systems installed after 1994 typically incorporate fixtures that adhere to stricter water efficiency standards. As a result, when assessing the performance of a more recent plumbing system, it is appropriate to compare it with a baseline that acknowledges these improved efficiencies. While the options suggest percentages that might seem subtly close, 120% effectively recognizes the higher level of water efficiency anticipated from systems compliant with post-1994 standards, differentiating it from older installations. Choosing a baseline higher than 100% accounts for the advancements in design and technology that facilitate reduced water use while ensuring that the system still meets or exceeds modern performance expectations. This approach is consistent with LEED's emphasis on sustainability and conservation efforts.