Members (continued)
- SABIC
- Sanchez Group
- Scheck Industries
- Screensafe, Inc.
- SET Environmental, Inc.
- Sherwin Williams Company
- Solvay USA INC
- Southwest Town Mechanical
- Spike Enterprise, INC
- Stanley Consultants Inc.
- Starcon
- Stepan Company
- Stevenson Crane, Rigging & Heavy Haul
- Structural Group
- Superheat FGH Services
- Superior Engineering LLC
- Swagelok Chicago | Milwaukee | St.Louis
- Team Furmanite
- Three Rivers Construction Alliance
- Total Safety Inc.
- Toyal America, INC
- Tradebe Environmenal Services
- Trinity Consultants
- Turnaround Consulting Services: Oil & Gas Consulting
- Valdes Engineering Company
- Valero Terminaling & Distribution
- United Rentals
- Veolia Environmental Services
- Waste Management Dolphin Services Industrial Waste Processing
- Wesco Machine & Tool
- Wet Solutions INC
- Wil County Emergency Management Agency
- Wood Environment & Infrastructure Solutions
- Wyatt Field Service Co.
- Zenith Energy