• ACTenviro
• ADSORBIT
• ALS Environmental
• Anderson Environmental Contracting, LLC
• Aquagga
• Blaine Tech Services
• Cascade
• CCS
• Clean Harbors
• Clear Creek Systems, Inc.
• Clear Water Services
• EA Engineering, Science, and Technology, Inc., PBC
• EDR/LightBox

• Emerald City Environmental Consulting
• EMSL Analytical, Inc. 
• Environmental Site Solutions
• EPRO - GEO-SEAL
• ERIS
• ERM
• ETEC
• Eurofins Environment Testing Northwest LLC
• Evonik
• Geosyntec
• Gullywasher
• Holocene Drilling
• Holt Services, Inc.
• JRW Bioremediation

• Landau Associates
• Maul Foster & Alongi
• Pace Analytical Laboratory
• Pacific Coast Carbon
• PBS
• Pollution Liability Insurance Agency 
• Rain for Rent
• REGENESIS
• Stego Industries
• United Rentals, Inc - Fluid Solutions Division
• Vista Clara
• WasteXpress
• WaterTectonics
• Yellow Jacket Drilling Services