OESI Associate Members are firms that supply goods or services to OESI Active Members, or have an interest in the advancement of proper waste management practices.

• Cox-Colvin & Associates, Inc.
• E-Tank, Ltd.
• EnviroServe
• Questar Solutions, LLC
• T&M Associates
• University of Findlay - Environment, Health, Safety & Sustainability Department
• Vickery Transportation, Inc. (Grammer Logistics)
• Vorys Sater, Seymour and Pease LLP