LEED v2009
Existing Building Operations
Water Efficiency
Cooling Tower Water Management

EBOM-2009 WEc4: Cooling Tower Water Management

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Credit language

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

WE credit 4.1 (1 point): Chemical management
Develop and implement a water management plan for the cooling tower or evaporative condenser that addresses chemical treatment, bleed-off, biological control and staff training as it relates to cooling tower maintenance. Improve water efficiency by installing and/or maintaining a conductivity meter and automatic controls to adjust the bleed rate and maintain proper concentration at all times.

AND/OR

WE credit 4.2 (1 point): Nonpotable water source use
Use makeup water that consists of at least 50% nonpotable water, such as harvested rainwater, harvested stormwater, air-conditioner condensate, swimming pool filter backwash water, cooling tower blowdown, pass-through (once-through) cooling water, recycled treated wastewater from toilet and urinal flushing, foundation drain water, municipally reclaimed water or any other appropriate on-site water source that is not naturally occurring groundwater or surface water. Have a measurement program in place that verifies makeup water quantities used from nonpotable sources. Meters must be calibrated within the manufacturer’s recommended interval if the building owner, management organization or tenant owns the meter. Meters owned by third parties (e.g., utilities or governments) are exempt. See all forum discussions about this credit »

Frequently asked questions

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See all forum discussions about this credit »

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Cost estimates for this credit

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Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.

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Checklists

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LEEDuser’s checklists walk you through the key action steps you need to earn a credit, including how to avoid common pitfalls and save money.

For full access, sign up now for LEEDuser Premium

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Documentation toolkit

The motherlode of cheat sheets

LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.

For full access, sign up now for LEEDuser Premium

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Addenda

01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000225

Remove the following text:OROPTION 2. Nonpotable Water Source Use (1 point)Replace with:AND/ORWE Credit 4.2 (1 point): Nonpotable Water Source Use

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000226

OROPTION 3. (2 points)Achieve both Options 1 and 2.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000224

Remove the following text:OPTION 1. Chemical Management (1 point)Replace with:WE Credit 4.1 (1 point): Chemical Management

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000229

In the third line of the third paragraph, replace "WE Credit 4, Option 2, Nonpotable Water Source Use" with "WE Credit 4.2 Cooling Tower Water Management - Nonpotable Water Source Use"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001384

Delete the Alternative Compliance Path for Projects Outside the U.S. box.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000227

In the last line of the first paragraph, replace "WE Credit 4, Option 2, Nonpotable Water Source Use" with "WE Credit 4.2 Cooling Tower Water Management - Nonpotable Water Source Use"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000223

Replace all instances of "WE Credit 4" and "Credit 4" with "WE Credits 4.1 - 4.2" and "Credits 4.1 - 4.2" respectively

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000226

OROPTION 3. (2 points)Achieve both Options 1 and 2.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000224

Remove the following text:OPTION 1. Chemical Management (1 point)Replace with:WE Credit 4.1 (1 point): Chemical Management

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001383

Add "or evaporative condenser" after "cooling tower" in the first sentence.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000225

Remove the following text:OROPTION 2. Nonpotable Water Source Use (1 point)Replace with:AND/ORWE Credit 4.2 (1 point): Nonpotable Water Source Use

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000228

In the first line of the third paragraph, replace "WE Credit 4, Option 1, Chemical Management" with "WE Credit 4.1 Cooling Tower Water Management - Chemical Management"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001382

Add "or evaporative condenser" after "cooling tower"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
See all forum discussions about this credit »
Guest expert

Ashwini Arun

WSP
Senior Sustainability Manager

LEEDuser overview

Frank advice from LEED experts

LEED is changing all the time, and every project is unique. Even seasoned professionals can miss a critical detail and lose a credit or even a prerequisite at the last minute. Our expert advice guides our LEEDuser Premium members and saves you valuable time.

For full access, sign up now for LEEDuser Premium

Already a premium member? Log in now

Credit language

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

WE credit 4.1 (1 point): Chemical management
Develop and implement a water management plan for the cooling tower or evaporative condenser that addresses chemical treatment, bleed-off, biological control and staff training as it relates to cooling tower maintenance. Improve water efficiency by installing and/or maintaining a conductivity meter and automatic controls to adjust the bleed rate and maintain proper concentration at all times.

AND/OR

WE credit 4.2 (1 point): Nonpotable water source use
Use makeup water that consists of at least 50% nonpotable water, such as harvested rainwater, harvested stormwater, air-conditioner condensate, swimming pool filter backwash water, cooling tower blowdown, pass-through (once-through) cooling water, recycled treated wastewater from toilet and urinal flushing, foundation drain water, municipally reclaimed water or any other appropriate on-site water source that is not naturally occurring groundwater or surface water. Have a measurement program in place that verifies makeup water quantities used from nonpotable sources. Meters must be calibrated within the manufacturer’s recommended interval if the building owner, management organization or tenant owns the meter. Meters owned by third parties (e.g., utilities or governments) are exempt. See all forum discussions about this credit »

Checklists

Step by step to LEED certification

LEEDuser’s checklists walk you through the key action steps you need to earn a credit, including how to avoid common pitfalls and save money.

For full access, sign up now for LEEDuser Premium

Already a premium member? Log in now

Documentation toolkit

The motherlode of cheat sheets

LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.

For full access, sign up now for LEEDuser Premium

Already a premium member? Log in now


Addenda

01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000225

Remove the following text:OROPTION 2. Nonpotable Water Source Use (1 point)Replace with:AND/ORWE Credit 4.2 (1 point): Nonpotable Water Source Use

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000226

OROPTION 3. (2 points)Achieve both Options 1 and 2.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000224

Remove the following text:OPTION 1. Chemical Management (1 point)Replace with:WE Credit 4.1 (1 point): Chemical Management

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000229

In the third line of the third paragraph, replace "WE Credit 4, Option 2, Nonpotable Water Source Use" with "WE Credit 4.2 Cooling Tower Water Management - Nonpotable Water Source Use"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001384

Delete the Alternative Compliance Path for Projects Outside the U.S. box.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000227

In the last line of the first paragraph, replace "WE Credit 4, Option 2, Nonpotable Water Source Use" with "WE Credit 4.2 Cooling Tower Water Management - Nonpotable Water Source Use"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000223

Replace all instances of "WE Credit 4" and "Credit 4" with "WE Credits 4.1 - 4.2" and "Credits 4.1 - 4.2" respectively

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000226

OROPTION 3. (2 points)Achieve both Options 1 and 2.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
01/02/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000224

Remove the following text:OPTION 1. Chemical Management (1 point)Replace with:WE Credit 4.1 (1 point): Chemical Management

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001383

Add "or evaporative condenser" after "cooling tower" in the first sentence.

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
01/02/2010– Updated: 14/02/2015
Rating System Correction
Description of change:
ad-100000225

Remove the following text:OROPTION 2. Nonpotable Water Source Use (1 point)Replace with:AND/ORWE Credit 4.2 (1 point): Nonpotable Water Source Use

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
14/04/2010– Updated: 14/02/2015
Reference Guide Correction
Description of change:
ad-100000228

In the first line of the third paragraph, replace "WE Credit 4, Option 1, Chemical Management" with "WE Credit 4.1 Cooling Tower Water Management - Chemical Management"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
No
06/07/2012– Updated: 14/02/2015
Global ACP
Description of change:
ad-100001382

Add "or evaporative condenser" after "cooling tower"

Inquiry:
Ruling:
Campus Applicable
No
Internationally Applicable:
Yes
See all forum discussions about this credit »
Guest expert

Ashwini Arun

WSP
Senior Sustainability Manager