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LEED v2009
Neighborhood Development
Green infrastructure & buildings
Minimum building water efficiency

LEED CREDIT

ND-v2009 GIBp3: Minimum building water efficiency Required

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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 20% 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 United States 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 prerequisite.

Commercial fixtures, fittings, or appliances

Baseline water usage

Commercial toilet

1.6 gpf1  (6 lpf1)
Except blow-out fixtures, 3.5 gpf (13.2 lpf)

Commercial urinal

1.0 gpf (4 lpf)

Commercial lavatory (restroom) faucet

2.2 gpm at 60 psi (8.5 lpm)  at 4 bar ( 58 psi), private applications only (hotel-motel guest rooms, hospital patient rooms)
0.5 gpm at 60 psi2 (2 lpm)  at  4 bar (58 psi) all others except private applications
0.25 gallons per cycle for metering faucets (1 liter per cycle)

Commercial prerinse spray valve (for food service applications)

Flow rate ≤ 1.6 gpm (6 lpm) (no pressure specified; no performance requirement)

1 EPAct 1992 standard for toilets applies to both commercial and residential models.
2 In addition to EPAct requirements, the American Society of Mechanical Engineers standard for public lavatory faucets is 0.5 gpm at 60 psi (2 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.

Residential Fixtures, Fittings, and Appliances

Baseline water usage

Residential toilet

1.6 gpf3 (6 lpf3)

Residential lavatory (bathroom) faucet

2.2 gpm at 60 psi (8.5 lpm)  at 4 bar ( 58 psi)

Residential kitchen faucet

Residential showerhead

2.5 gpm at 80 psi per shower stall4 (9.5 lpm) at 5.5 bar (80 psi)

gpf = gallons per flush; psi = pounds per square inch.
Source: Adapted from information developed and summarized by the U.S. EPA Office of Water.
3 EPAct 1992 standard for toilets applies to both commercial and residential models.
4 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, shall be limited to the allowable showerhead flow rate as specified above (2.5-gpm or  9.5 lpm ) per shower compartment, where the floor area of the shower compartment is less than 2,500 sq.in. (1,600,000 sq. mm). For each increment of 2,500 sq.in. (1,600,000 sq. mm). 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 shall be allowed. Exception: Showers that emit recirculated non-potable 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.

The following fixtures, fittings, and appliances are outside the scope of the water use reduction calculation:
  1. Commercial steam cookers.
  2. Commercial dishwashers.
  3. Automatic commercial ice makers.
  4. Commercial (family-sized) clothes washers.
  5. Residential clothes washers.
  6. Standard and compact residential dishwashers.
AND
For new single-family residential buildings and new multiunit residential buildings three stories or fewer, 90% of buildings must use a combination of fixtures that would earn 3 points under LEED for Homes 2008 WE Credit 3, Indoor Water Use. See all forum discussions about this credit »

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Addenda

7/19/2010Updated: 2/14/2015
Reference Guide Correction
Description of change:
Replace both instances of "Table 8" with "Table 9"
Campus Applicable
No
Internationally Applicable:
No
8/1/2011Updated: 2/14/2015
Reference Guide Correction
Description of change:
In the sixth row (Lavatory faucet) replace the duration (sec) of 15 with 30; add a superscript "b" next to "Lavatory faucet" and add note "b" below table: "Default duration for the metering type / autocontrol faucet is 15 seconds for the baseline and 12 seconds for the design case."
Campus Applicable
No
Internationally Applicable:
No
11/3/2010Updated: 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
7/1/2014Updated: 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"
Campus Applicable
No
Internationally Applicable:
Yes
11/3/2010Updated: 2/14/2015
Reference Guide 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
7/19/2010Updated: 2/14/2015
Reference Guide Correction
Description of change:
In the second line of the paragraph, replace "8" with "9" so the text becomes "...according to Table 9..."
Campus Applicable
No
Internationally Applicable:
No
8/1/2011Updated: 2/14/2015
Reference Guide Correction
Description of change:
Replace the section text with the following:This prerequisite is limited to savings generated by the following water-using fixtures and fixture fittings as applicable to the project: water closets, urinals, lavatory faucets, showers, kitchen sink faucets and pre-rinse spray valves, as shown in Table 1. The "Kitchen sinks" category encompasses all sinks in public or private buildings that are used with patterns and purposes similar to a sink in a residential kitchen; break room sinks would be included. However professional grade / commercial faucets such as those used in a commercial kitchen would not be included. The "Public lavatory faucets" and "Private lavatory faucets" categories encompass all sinks used primarily for hand-washing regardless of location. Faucets whose usage patterns and flow rates are regulated for medical or industrial purposes (e.g. laboratory sinks) and do not fall under the definition of private or public use are not included. Faucets used exclusively for filling operations (e.g. pot-filler) can be excluded. All other fixtures and fixtures fittings must be included in the calculations unless there are special circumstances that justify excluding them.
Campus Applicable
No
Internationally Applicable:
No
4/1/2013Updated: 2/14/2015
Rating System Correction
Description of change:
In the 2/2/2011 Addenda, replace the baseline in the related note below table with “Default duration for the metering type / autocontrol lavatory faucet is 0.25 gallons per cycle (gpc) for the baseline case and 12 seconds for the design case.”
Campus Applicable
No
Internationally Applicable:
Yes
8/1/2011Updated: 2/14/2015
Reference Guide Correction
Description of change:
See revised image
Campus Applicable
No
Internationally Applicable:
No
11/1/2011
LEED Interpretation
Inquiry:

Does a single-occupant lockable bathroom in a commercial establishment count as "private" for flush & flow rate calculations?

Ruling:

The project team is requesting a ruling on whether restrooms at a commercial establishment that are only usable by one individual or family at a time are considered private or private-use facilities. The facilities that are usable by one individual or family at a time at a commercial establishment are not considered private or private-use facilities. The private or public categories for lavatory faucets are based on the UPC and IPC Standards for plumbing fixtures, and are referring to the anticipated uses and performance expectations of such faucets. Public restroom faucets are used almost exclusively for hand washing or simple rinsing, compared to lavatory faucets in homes and in other private bathrooms that are used for various purposes. Therefore the single occupancy restroom facilities at a commercial establishment are not private-use facilities and the baseline case must be calculated according to the public lavatory faucet baseline flow rate. Applicable internationally.

Campus Applicable
No
Internationally Applicable:
Yes
See all forum discussions about this credit »

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USGBC logo

© 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 20% 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 United States 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 prerequisite.

Commercial fixtures, fittings, or appliances

Baseline water usage

Commercial toilet

1.6 gpf1  (6 lpf1)
Except blow-out fixtures, 3.5 gpf (13.2 lpf)

Commercial urinal

1.0 gpf (4 lpf)

Commercial lavatory (restroom) faucet

2.2 gpm at 60 psi (8.5 lpm)  at 4 bar ( 58 psi), private applications only (hotel-motel guest rooms, hospital patient rooms)
0.5 gpm at 60 psi2 (2 lpm)  at  4 bar (58 psi) all others except private applications
0.25 gallons per cycle for metering faucets (1 liter per cycle)

Commercial prerinse spray valve (for food service applications)

Flow rate ≤ 1.6 gpm (6 lpm) (no pressure specified; no performance requirement)

1 EPAct 1992 standard for toilets applies to both commercial and residential models.
2 In addition to EPAct requirements, the American Society of Mechanical Engineers standard for public lavatory faucets is 0.5 gpm at 60 psi (2 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.

Residential Fixtures, Fittings, and Appliances

Baseline water usage

Residential toilet

1.6 gpf3 (6 lpf3)

Residential lavatory (bathroom) faucet

2.2 gpm at 60 psi (8.5 lpm)  at 4 bar ( 58 psi)

Residential kitchen faucet

Residential showerhead

2.5 gpm at 80 psi per shower stall4 (9.5 lpm) at 5.5 bar (80 psi)

gpf = gallons per flush; psi = pounds per square inch.
Source: Adapted from information developed and summarized by the U.S. EPA Office of Water.
3 EPAct 1992 standard for toilets applies to both commercial and residential models.
4 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, shall be limited to the allowable showerhead flow rate as specified above (2.5-gpm or  9.5 lpm ) per shower compartment, where the floor area of the shower compartment is less than 2,500 sq.in. (1,600,000 sq. mm). For each increment of 2,500 sq.in. (1,600,000 sq. mm). 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 shall be allowed. Exception: Showers that emit recirculated non-potable 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.

The following fixtures, fittings, and appliances are outside the scope of the water use reduction calculation:
  1. Commercial steam cookers.
  2. Commercial dishwashers.
  3. Automatic commercial ice makers.
  4. Commercial (family-sized) clothes washers.
  5. Residential clothes washers.
  6. Standard and compact residential dishwashers.
AND
For new single-family residential buildings and new multiunit residential buildings three stories or fewer, 90% of buildings must use a combination of fixtures that would earn 3 points under LEED for Homes 2008 WE Credit 3, Indoor Water Use.
See all LEEDuser forum discussions about this credit » Unsubscribe from discussions about ND-v2009 GIBp3