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emily reese moody
LEED AP BD+C, GGP, GPCP, ENV SP, Fitwel Ambassador, GCP
Jacobs
Sustainability Director, Certifications & Compliance
SPECIAL REPORT
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
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 showerheads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the U.S.).
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 |
||
Projects located where standard supply pressure is different than the LEED baseline supply pressure may calculate the water consumption of flow fixtures and fittings at the local standard supply pressure; the supply pressure must be consistent in the baseline and proposed case.
Appliance and Process Water Use
Install appliances, equipment, and processes within the project scope that meet the requirements listed in the tables below.
Existing appliances intended for reuse in the project are not required to meet the requirements in Table 2.
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 | ENERGY STAR or performance equivalent |
| 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:
|
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 |
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Cost estimates for this credit
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
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 showerheads that are eligible for labeling must be WaterSense labeled (or a local equivalent for projects outside the U.S.).
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 |
||
Projects located where standard supply pressure is different than the LEED baseline supply pressure may calculate the water consumption of flow fixtures and fittings at the local standard supply pressure; the supply pressure must be consistent in the baseline and proposed case.
Appliance and Process Water Use
Install appliances, equipment, and processes within the project scope that meet the requirements listed in the tables below.
Existing appliances intended for reuse in the project are not required to meet the requirements in Table 2.
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 | ENERGY STAR or performance equivalent |
| 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:
|
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 |
LEEDuser expert
emily reese moody
LEED AP BD+C, GGP, GPCP, ENV SP, Fitwel Ambassador, GCP
Jacobs
Sustainability Director, Certifications & Compliance
