In the LEED

Credits WE 3.1 & WE 3.2 are the same except for the percent (%) reduction. If one completes the requirements and implementation for WE 3.2 - Water Use Reduction - 30%, they would also receive a point for WE 3.1. Thus, earning two points toward LEED accreditation for the project. The posts for WE 3.1 and WE 3.2 are exactly the same except for the percent reduction.Water Use Reduction - 30%Intention:

1. Maximize water efficiency
2. Reduce burden on municipal water supply
3. Reduce burden on wastewater system

Implementation:

1. Method: Use special fixtures and sensor/metering controls.
   • ( fixture/flowrate in Gallons Per Minute [GPM] )
   • Shower/2.5 (lowflow/1.8)
   • Lavatory/2.5 (lowflow/1.8) (ultra lowflow/0.5)
   • Kitchen Sink/2.5 (lowflow/1.8)
   • Faucets/2.5
   • Aerator/2.5
   • Water Closet/1.6 (lowflow/1.1)
   • Dual Flush Water Closet/1.6 (lowflow/0.8)
   • Composting Toilet/0.0
   • Urinal/1 (lowflow/0.5)
   • Non-Water Urinal/0.0

• For calculations, consider:
  • DO NOT include irrigation water
  • Only applicable for the following fixtures:
  • • water closets
    • urinals
    • lavatory faucets
    • showers
    • kitchen sinks
  • Daily Residential Usages:
    • 1 person 5 uses per day of flush and flow fixtures
• Also use high-efficiency fixtures above, dry fixtures, occupant sensors.
• Consider reusing stormwater and graywater for non-potable uses.

Codes/Standards Applied:

1. Energy Policy Act 1992 (different from the EPA)

Extra Credit:

• For both WE3.1 & WE3.2: 40% (instead of 20% or 30%) reduction of water usage

OR

• Process and non-regulated water use savings is at least 10%

Submittal Phase:

• design

Links from Reference Guide:

1. Composting Toilet Reviews
2. Terry Love’s Consumer Toilet Reports
3. Water Efficiency Manual for Commercial, Industrial, and Institutional Facilities
4. Water Measurement Manual: A Water Resources Technical Publication
5. Water Wiser: The Water Efficiency Clearinghouse

Other Water Efficiency Credits

• WE 1.1 - Water Efficient Landscaping - Reduce by 50%
• WE 1.2 - Water Efficient Landscaping - No Potable Use or No Irrigation
• WE 2 - Innovative Wastewater Technologies
• WE 3.1 - Water Use Reduction - 20% Reduction
• WE 3.2 - Water Use Reduction - 30% Reduction

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