2.0
Water Efficiency
5
Score
Water Efficient Landscaping (2)
2.C1
Intent:
Limit or eliminate the use of potable water for landscape irrigation.
Requirement:
Use high efficiency irrigation technology, OR, use captured rain or recycled site water to reduce potable
1
water consumption for irrigation by 50% over conventional means.
Use only captured rain or recycled site water for an additional 50% reduction (100% total reduction) of
1
potable water for site irrigation needs, OR, do not install permanent landscape irrigation systems.
Technologies
Develop a landscaping water use baseline according to the methodology outlined in the LEED Reference Guide.
/Strategies:
Specify water-efficient, native or adapted, climate tolerant plantings. High efficiency irrigation technologies
include micro irrigation, moisture sensors, or weather data based controllers. Feed irrigation systems with
captured rainwater, gray water, or on-site treated wastewater.
Innovative Wastewater Technologies (2)
2.C2
Intent:
Reduce generation of wastewater and potable water demand, while increasing local aquifer recharge.
Requirement:
Reduce the use of municipally provided potable water for building sewage conveyance by a minimum of
1
50%, OR, treat 100% of wastewater on site to tertiary standards.
Technologies
Develop a wastewater baseline according to the methodology outlined in the LEED Reference Guide. Implement
/Strategies:
decentralized on-site wastewater treatment and reuse systems. Decrease the use of potable water for sewage
conveyance by utilizing gray and/or black water systems. Non-potable reuse opportunities include, toilet flushing,
landscape irrigation, etc. Provide advanced wastewater treatment after use by employing innovative, ecological,
on-site technologies including constructed wetlands, a mechanical recirculating sand filter, or aerobic treatment
systems.
(1)
2.C3
Water Use Reduction
Intent:
Maximize water efficiency within buildings to reduce the burden on municipal water supply and wastewater
systems.
Requirement:
Employ strategies that in aggregate use 20% less water than the water use baseline calculated for the
1
building (not including irrigation) after meeting Energy Policy Act (EPACT) of 1992 fixture performance
requirements.
Exceed the potable water use reduction by an additional 10% (30% total efficiency increase).
1
Technologies
Develop a water use baseline including all water consuming fixtures, equipment, and seasonal conditions
/Strategies:
according to methodology guidance outlined in the LEED Reference Guide. Specify water conserving plumbing
fixtures that exceed Energy Policy Act (EPACT) of 1992 fixture requirements in combination with ultra high
efficiency or dry fixture and control technologies. Specify high water efficiency equipment (dishwashers, laundry,
cooling towers, etc.). Use alternatives to potable water for sewage transport water. Use recycled or storm water
for HVAC/process make up water. Install cooling tower systems designed to minimize water consumption from
drift, evaporation and blowdown.
(2)
U. S. Green Building Council. Used by permission.
(1)
Adapted material not reviewed or endorsed by U. S. Green Building Council.
Sustainable Project Rating Tool (SPiRiT) v.1.4.1
June 2002
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