LEED Green Associate Exam
Water Efficiency Practice Questions
50 practice questions with detailed explanations — aligned to the LEED Green Associate Exam.
Master Water Efficiency to boost your score on the LEED Green Associate Exam. Each question below mirrors the style and difficulty of real exam questions, complete with detailed explanations so you understand the why behind every answer. Work through all 50 questions, review any that trip you up, and use the related topics below to round out your preparation.
Q1.What is the baseline fixture flush/flow rate referenced for the LEED Water Efficiency prerequisite?
A.EPA WaterSense specificationsB.The Energy Policy Act (EPAct) of 1992 standardsC.State plumbing codesD.The IPC (International Plumbing Code)B. The Energy Policy Act (EPAct) of 1992 standardsExplanation: LEED's water efficiency credits typically use the Energy Policy Act (EPAct) 1992 and 2005 as the baseline fixture performance standard. Projects must show percentage reductions compared to this baseline. Fixtures performing better than baseline earn points.
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Q2.Which type of water use is addressed by the LEED Outdoor Water Use Reduction prerequisite?
A.Process water used in manufacturing or coolingB.Irrigation water for landscapingC.Domestic hot water for showers and sinksD.Fire suppression waterB. Irrigation water for landscapingExplanation: The LEED Outdoor Water Use Reduction prerequisite specifically addresses landscape irrigation. Projects must demonstrate strategies to reduce or eliminate potable water use for irrigation through plant selection (native/adaptive plants), efficient irrigation systems, or non-potable water sources.
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Q3.What is greywater?
A.Stormwater runoff from paved surfacesB.Wastewater from sinks, showers, and laundry — not from toiletsC.Treated municipal wastewater released to natural waterwaysD.Drinking water that has been stored and may be contaminatedB. Wastewater from sinks, showers, and laundry — not from toiletsExplanation: Greywater is wastewater from non-toilet fixtures (sinks, showers, bathtubs, laundry) that contains relatively low levels of contamination. In LEED, greywater can be reused for non-potable applications (toilet flushing, irrigation) to reduce potable water demand.
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Q4.What flow rate (GPF) does a WaterSense-labeled dual-flush toilet use for a full flush?
A.3.5 GPFB.1.6 GPFC.1.28 GPF (high-efficiency toilet standard)D.0.8 GPFC. 1.28 GPF (high-efficiency toilet standard)Explanation: WaterSense-labeled toilets must use no more than 1.28 gallons per flush (GPF) for a full flush — 20% less than the 1.6 GPF EPAct standard. Dual-flush toilets use 1.28 GPF (full) and 0.8 GPF (reduced). These rates are important for LEED water efficiency calculations.
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Q5.Which LEED credit rewards projects for metering water use to support conservation?
A.WE Prerequisite: Indoor Water Use ReductionB.WE Credit: Water MeteringC.SS Credit: Rainwater ManagementD.EA Credit: Advanced Energy MeteringB. WE Credit: Water MeteringExplanation: The Water Metering credit in LEED rewards projects for installing water meters that track a minimum number of subsystems (irrigation, indoor plumbing, reclaimed water, etc.). Metering enables ongoing monitoring, early leak detection, and data-driven conservation.
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