Intent
To reduce indoor water consumption.
Requirements
Nonresidential buildings, mixed-use buildings, and multifamily residential buildings four stories or more
For new buildings and buildings undergoing major renovations as part of the project, reduce indoor water usage by an average of 20% from a baseline. All newly installed toilets, urinals, private lavatory faucets, and showerheads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the United States).
For the fixtures and fittings listed in Table 1, as applicable to the project scope, reduce water consumption by 20% from the baseline. Base calculations on the volumes and flow rates shown in Table 1.
The design case is calculated as a weighted average of water usage for the buildings constructed as part of the project based on their floor area.
Table 1. Baseline water consumption of fixtures and fittings
| Commercial Fixtures, Fittings, and Appliances | Current Baseline (IP Units) | Current Baseline (SI units) |
|---|---|---|
| Water closets (toilets)* | 1.6 gallons per flush (gpf) | 6 liters per flush (lpf) |
| Urinal* | 1.0 (gpf) | 3.8 lpf |
| Public lavatory (restroom) faucet | 0.5 gpm at 60 psi** all others except private applications | 1.9 lpm at 415 kPa, all others except private applications |
| Private lavatory faucet* | 2.2 gpm at 60 psi | 8.3 lpm at 415 kPa |
| Kitchen faucet (excluding faucets used exclusively for filling operations) | 2.2 gpm at 60 psi | 8.3 lpm at 415 kPa |
| Showerhead* | 2.5 gpm at 80 psi per shower stall | 9.5 lpm at 550 kPa per shower stall |
| * WaterSense label available for this product type gpf = gallons per flush gpm = gallons per minute psi = pounds per square inch lpf = liters per flush lpm = liters per minute kPa = kilopascals |
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New single-family residential buildings and new multiunit residential buildings three stories or fewer
90% of residential buildings must use a combination of fixtures and fittings that would earn 2 points under LEED for Homes 2012 WE Credit Indoor Water Use.
Step by step guidance
Common steps
The calculation to support this prerequisite compares a design case to a baseline case.
- Be certain to select WaterSense Fittings and Fixtures for those units that are subject to WaterSense labeling.
- The calculation for this prerequisite is:
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