Companies

• American Water (USA)
• CH2M HILL OMI (USA)
• Compliance Solutions (USA)
• Davey Tree Expert Company (USA)
• ECI (USA)
• Environmental Management Corp. (USA)
• Grassroots Campaigns, Inc. (USA)
• Newalta (USA and Canada)
• Stericycle Inc. (USA and Canada)

Non-profits

• Center for Ecological Management of Military Lands (USA)
• Eastern National (USA)
• Green Corps (USA)
• Southern Sustainable Agriculture Working Group (USA)