Section 2: Individual LEED Credit Reviews
LEED Credit WE-3.2:
Additional strategies that might be considered
include:
Water Use Reduction
Dual flush toilets (1.6/0.8 gpf)
30% Reduction
Ultra low flush toilets (1.1 to 1.4 gpf)
Foot pedal controls for lavatories
Low flow urinals (rated at 0.5 gal/flush)
Intent
Waterless urinals
Maximize water efficiency within buildings to
Strategies that were deemed unlikely for typical
reduce the burden on municipal water supply
GSA buildings for cost or practicality purposes
and wastewater systems.
include:
Requirement
Stormwater collection and treatment systems
Greywater collection and treatment systems
Employ strategies that in aggregate use 30% less
Blackwater collection and treatment systems
water than the water use baseline calculated for
the building (not including irrigation) after
Composting toilets
meeting Energy Policy Act of 1992 fixture
performance requirements.
Basis for Cost Assumption
(1 point)
In the Courthouse and Office Building models,
water use reductions of 30 percent or more are
demonstrated by combining the following systems:
Cost Impact = 4
0.5 gpm faucets at bathroom lavatories
Infrared sensor controls on lavatory faucets
1
2
3
4
5
(hard-wired system)
0.5 gpf urinals (including hard-wired electronic
GSA
No
Low
Moderate
High
Standard
premium,
premium
premium
premium
controls)
(no cost)
psble svgs
(<50K)
(50-150K)
(>150K)
2.0 gpm showers (where showers are included
in the program)
Practical Applications
Project assumptions are included in the
"Supporting Calculations" section below.
As with credit WE-3.1, this credit addresses
internal plumbing fixtures, specifically faucets,
Of the listed systems, cost premiums are defined
showers, toilets, and urinals. Additional building
for the infrared sensor controls (including wiring)
water use sources, such as cooling towers and
and 0.5 gpf urinals (including wiring).
dishwashers, are considered "process loads" and
are not included. Because of this defined scope, the
strategies that would likely be employed to meet
the credit criteria include the following:
Low flow lavatory faucets/aerators (rated at
2.0 gpm or less)
Ultra-low flow lavatory faucets (rated at 0.5
gpm)
Electronic (infrared) sensors to automatically
turn faucets on and off
Low flow kitchen sinks (rated at 2.0 gpm or
less)
Low flow showerheads (rated at 2.0 gpm or
less)
GSA LEED COST STUDY
65
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