In the third line, insert "WE" after "2008" so the text becomes "Homes 2008 WE Credit 3"
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
For nonresidential buildings, mixed-use buildings, and multifamily residential buildings four stories or more: Indoor water usage in new buildings and buildings undergoing major renovations as part of the project must be an average 40% less than in baseline buildings. The baseline usage is based on the requirements of the United States Energy Policy Act of 1992 and subsequent rulings by the Department of Energy, the requirements of the Energy Policy Act of 2005, and the fixture performance standards in the 2006 editions of the Uniform Plumbing Code or International Plumbing Code as to fixture performance. Calculations are based on estimated occupant usage and include only the following fixtures and fixture fittings (as applicable to the project scope): water closets (toilets), urinals, lavatory faucets, showers, kitchen sink faucets, and prerinse spray valves. The water efficiency threshold is calculated as a weighted average of water usage for the buildings constructed as part of the project based on their conditioned area. Projects may also follow the LEED for Multiple Buildings and On-Campus Building Application Guide alternative calculation methodology to show compliance with this credit.
| Commercial Fixtures, Fittings, and Appliances | Current Baseline (Imperial Units) | Current Baseline (Metric units) |
|---|---|---|
| Commercial Toilets | 1.6 gallons per flush (gpf)* Except blow-out fixtures: 3.5 (gpf) |
6 liters per flush (lpf) Except blow-out fixtures: 13 lpf |
| Commercial Urinals | 1.0 (gpf) | 4 lpf |
| Commercial Lavatory (Restroom) Faucets | 2.2 gallons per minute (gpm) at 60 pounds per square inch (psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 0.5 (gpm) at 60 (psi)** all others except private applications 0.25 gallons per cycle for metering faucets |
8.5 liters per minute (lpm) at 4 bar (58 psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 2.0 lpm at 4 bar (58 psi), all others except private applications 1 liter per cycle for metering faucets |
| Showerheads | 2.5 (gpm) at 80 (psi) per shower stall **** | 9.5 lpm at 5 bar (58 psi) |
| For projects with commercial pre-rinse spray valves, the flow rate must comply with the asME a112.18.1 standard of 1.6 gpm or less. | ||
| Residential fixtures, fittings, and appliances | Current baseline (imperial units) | Current baseline (metric units) |
|---|---|---|
| Residential toilets | 1.6 (gpf)*** | 6 liters per flush (lpf) Except blow-out fixtures: 13 lpf |
| Residential lavatory (bathroom) faucets | 2.2 (gpm) at 60 psi | 4 lpm 8.5 lpm at 4 bar (58 psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 2.0 lpm at 4 bar (58 psi), all others except private applications 1 liter per cycle for metering faucets |
| Residential kitchen faucet | ||
| Residential showerheads | 2.5 (gpm) at 80 (psi) per shower stall**** | flow rate ≤ 6.1 lpm (no pressure specified; no performance requirement) |
|
* EPAct1992 standard for toilets applies to both commercial and residential models. ** in addition to Epact requirements, the american society of Mechanical Engineers standard for public lavatory faucets is 0.5 gpm at 60 psi (2.0 lpm at 4 bar (58 psi)) (asME a112.18.1-2005). this maximum has been incorporated into the national uniform plumbing Code and the international plumbing Code. *** EPAct 1992 standard for toilets applies to both commercial and residential models. **** residential shower compartment (stall) in dwelling units: the total allowable flow rate from all flowing showerheads at any given time, including rain systems, waterfalls, bodysprays, bodyspas and jets, must be limited to the allowable showerhead flow rate as specified above (2.5 gpm) per shower compartment, where the floor area of the shower compartment is less than 2,500 square inches (1.5 square meters). for each increment of 2,500 square inches (1.5 square meters) of floor area thereafter or part thereof, an additional showerhead with total allowable flow rate from all flowing devices equal to or less than the allowable flow rate as specified above must be allowed. Exception: showers that emit recirculated nonpotable water originating from within the shower compartment while operating are allowed to exceed the maximum as long as the total potable water flow does not exceed the flow rate as specified above. |
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What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
Learn more about The Cost of LEED v4 »Frequently asked questions
See all forum discussions about this credit »Addenda
11/3/2010 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
Campus Applicable
No
Internationally Applicable:
No
11/3/2010 – Updated: 2/14/2015
Rating System Correction
Description of change:
In the third line, insert "WE" after "2008" so the text becomes "Homes 2008 WE Credit 3"
Campus Applicable
No
Internationally Applicable:
No
7/1/2014 – Updated: 2/14/2015
Global ACP
Description of change:
Add "United States" in front of "Energy Policy Act of 1992"
Under the third paragraph replace "square footage" with "area"
Under the third paragraph replace "square footage" with "area"
Campus Applicable
No
Internationally Applicable:
Yes
7/19/2010 – Updated: 2/14/2015
Reference Guide Correction
Description of change:
In the fourth line of the third paragraph, replace "prerequisite" with "credit" so the text becomes "...show compliance with this credit."
Campus Applicable
No
Internationally Applicable:
No
7/19/2010 – Updated: 2/14/2015
Rating System Correction
Description of change:
In the fourth line of the third paragraph, replace "prerequisite" with "credit" so the text becomes "...show compliance with this credit."
Campus Applicable
No
Internationally Applicable:
No
Documentation toolkit
The motherlode of cheat sheets
LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
For nonresidential buildings, mixed-use buildings, and multifamily residential buildings four stories or more: Indoor water usage in new buildings and buildings undergoing major renovations as part of the project must be an average 40% less than in baseline buildings. The baseline usage is based on the requirements of the United States Energy Policy Act of 1992 and subsequent rulings by the Department of Energy, the requirements of the Energy Policy Act of 2005, and the fixture performance standards in the 2006 editions of the Uniform Plumbing Code or International Plumbing Code as to fixture performance. Calculations are based on estimated occupant usage and include only the following fixtures and fixture fittings (as applicable to the project scope): water closets (toilets), urinals, lavatory faucets, showers, kitchen sink faucets, and prerinse spray valves. The water efficiency threshold is calculated as a weighted average of water usage for the buildings constructed as part of the project based on their conditioned area. Projects may also follow the LEED for Multiple Buildings and On-Campus Building Application Guide alternative calculation methodology to show compliance with this credit.
| Commercial Fixtures, Fittings, and Appliances | Current Baseline (Imperial Units) | Current Baseline (Metric units) |
|---|---|---|
| Commercial Toilets | 1.6 gallons per flush (gpf)* Except blow-out fixtures: 3.5 (gpf) |
6 liters per flush (lpf) Except blow-out fixtures: 13 lpf |
| Commercial Urinals | 1.0 (gpf) | 4 lpf |
| Commercial Lavatory (Restroom) Faucets | 2.2 gallons per minute (gpm) at 60 pounds per square inch (psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 0.5 (gpm) at 60 (psi)** all others except private applications 0.25 gallons per cycle for metering faucets |
8.5 liters per minute (lpm) at 4 bar (58 psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 2.0 lpm at 4 bar (58 psi), all others except private applications 1 liter per cycle for metering faucets |
| Showerheads | 2.5 (gpm) at 80 (psi) per shower stall **** | 9.5 lpm at 5 bar (58 psi) |
| For projects with commercial pre-rinse spray valves, the flow rate must comply with the asME a112.18.1 standard of 1.6 gpm or less. | ||
| Residential fixtures, fittings, and appliances | Current baseline (imperial units) | Current baseline (metric units) |
|---|---|---|
| Residential toilets | 1.6 (gpf)*** | 6 liters per flush (lpf) Except blow-out fixtures: 13 lpf |
| Residential lavatory (bathroom) faucets | 2.2 (gpm) at 60 psi | 4 lpm 8.5 lpm at 4 bar (58 psi), private applications only (hotel or motel guest rooms, hospital patient rooms) 2.0 lpm at 4 bar (58 psi), all others except private applications 1 liter per cycle for metering faucets |
| Residential kitchen faucet | ||
| Residential showerheads | 2.5 (gpm) at 80 (psi) per shower stall**** | flow rate ≤ 6.1 lpm (no pressure specified; no performance requirement) |
|
* EPAct1992 standard for toilets applies to both commercial and residential models. ** in addition to Epact requirements, the american society of Mechanical Engineers standard for public lavatory faucets is 0.5 gpm at 60 psi (2.0 lpm at 4 bar (58 psi)) (asME a112.18.1-2005). this maximum has been incorporated into the national uniform plumbing Code and the international plumbing Code. *** EPAct 1992 standard for toilets applies to both commercial and residential models. **** residential shower compartment (stall) in dwelling units: the total allowable flow rate from all flowing showerheads at any given time, including rain systems, waterfalls, bodysprays, bodyspas and jets, must be limited to the allowable showerhead flow rate as specified above (2.5 gpm) per shower compartment, where the floor area of the shower compartment is less than 2,500 square inches (1.5 square meters). for each increment of 2,500 square inches (1.5 square meters) of floor area thereafter or part thereof, an additional showerhead with total allowable flow rate from all flowing devices equal to or less than the allowable flow rate as specified above must be allowed. Exception: showers that emit recirculated nonpotable water originating from within the shower compartment while operating are allowed to exceed the maximum as long as the total potable water flow does not exceed the flow rate as specified above. |
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