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- Anheuser-Busch
- Aquarion Water Company
- Astra Zeneca Pharmaceutical
- Bay State Gas
- Becker College
- Bose Corporation
- Charter Communications
- Cisco Systems
- City of Cambridge, MA
- City of Holyoke, MA
- City of Springfield, MA
- City of Worcester, MA
- Clark University
- Connecticut Water Company
- Energy East
- Fitchburg Gas and Electric
- Foxwoods
- Genzyme
- Hewlett Packard
- Imperial Distributors
- Keyspan
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- Manchester Water Works
- Mashantucket Pequot Tribal Nation
- Morgan Construction
- MWRA
- New Hampshire Gas
- NSTAR
- Pennichuck Water Company
- Regis College
- Saint-Gobain
- Town of Enfield, CT
- Unitil
- University of Connecticut
- University of Massachusetts Medical Center
- University of New Hampshire
- Verizon
- Veryfine Products
- Waters Corporation
- White Mountain Cable
- Worcester Polytechnic Institute
- Wyman-Gordon
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