Required
Intent
To reduce indoor water consumption.
Requirements
Building Water Use
For the fixtures and fittings listed in Table 1, as applicable to the project scope, reduce aggregate water consumption by 20% from the baseline. Base calculations on the volumes and flow rates shown in Table 1. All newly installed toilets, urinals, private lavatory faucets, and shower heads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the U.S.).Projects where fixtures or fixture fittings are not within the tenant spaces are exempt from this prerequisite.
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 |
Shower head* |
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 |
Appliance and process water use
Install appliances, equipment, and processes within the project scope that meet the requirements listed in the tables below .
Table 2. Standards for appliances
Appliance |
Requirement |
Residential clothes washers |
ENERGY STAR or performance equivalent |
Commercial clothes washers |
CEE Tier 3A |
Residential dishwashers (standard and compact) |
ENERGY STAR or performance equivalent |
Prerinse spray valves |
≤ 1.3 gpm (4.9 lpm) |
Ice machine |
ENERGY STAR or performance equivalent and use either air-cooled or closed-loop cooling, such as chilled or condenser water system |
gpm = gallons per minute
lpm = liters per minute
Table 3. Standards for processes
Process |
Requirement |
Heat rejection and cooling |
No once-through cooling with potable water for any equipment or appliances that reject heat |
Cooling towers and evaporative condensers |
Equip with:
- makeup water meters
- conductivity controllers and overflow alarms
- efficient drift eliminators that reduce drift to maximum of 0.002% of recirculated water volume for counterflow towers and 0.005% of recirculated water flow for cross-flow towers
|
In addition, water-consuming appliances, equipment, and processes must meet the requirements listed in Tables 4 and 5.
Table 4. Standards for appliances
Kitchen equipment |
Requirement (IP units) |
Requirement (SI units) |
Dishwasher |
Undercounter |
≤ 1.6 gal/rack |
≤ 6.0 liters/rack |
Stationary, single tank, door |
≤ 1.4 gal/rack |
≤ 5.3 liters/rack |
Single tank, conveyor |
≤ 1.0 gal/rack |
≤ 3.8 liters/rack |
Multiple tank, conveyor |
≤ 0.9 gal/rack |
≤ 3.4liters/rack |
Flight machine |
≤ 180 gal/hour |
≤ 680 liters/hour |
Food steamer |
Batch |
≤ 6 gal/hour/pan |
≤ 23 liters/hour/pan |
Cook-to-order |
≤ 10 gal/hour/pan |
≤ 38 liters/hour/pan |
Combination oven |
Countertop or stand |
≤ 3.5 gal/hour/pan |
≤ 13 liters/hour/pan |
Roll-in |
≤ 3.5 gal/hour/pan |
≤ 13 liters/hour/pan |
Table 5. Standards for processes
Process |
Requirement |
Discharge water temperature tempering |
Where local requirements limit discharge temperature of fluids into drainage system, use tempering device that runs water only when equipment discharges hot water OR Provide thermal recovery heat exchanger that cools drained discharge water below code-required maximum discharge temperatures while simultaneously preheating inlet makeup water OR If fluid is steam condensate, return it to boiler |
Venturi-type flow-through vacuum generators or aspirators |
Use no device that generates vacuum by means of water flow through device into drain |
© Copyright U.S. Green Building Council, Inc. All rights reserved.
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