- ACTenviro
- Advanced Test Equipment Rentals
- AECOM
- Alta Science and Engineering
- Amazon
- Anderson Environmental Contracting, LLC
- BB&A Environmental
- Blaine Tech Services, Inc.
- Cascade Drilling/Technical Services
- Cemtek KVB-Enertec
- CIF Composites Inc.
- Clean Harbors
- CleanAir Engineering
- CleanWay Environmental Partners, Inc.
- Clear Creek Systems, Inc.
- Clear Water Services, LLC
- Covanta Environmental Solutions
- DH Environmental, Inc.
- EA Engineering, Science, and Technology, Inc., PBC
- EDR
- Environmental Monitoring and Technologies, Inc.
- ERIS - Environmental Risk Information Services
- Eurofins TestAmerica/Eurofins Frontier Global Sciences, LLC
- Field Environmental Instruments, Inc.
- GeoSearch
- Gunderson
- Heritage Environmental Services, LLC
- Holocene Drilling
- Holt Services, Inc.
- Ingenium Group
- Jacobs Engineering
- JRW Bioremediation
- KEMRON Environmental Services, Inc.
- Landau Associates
- LOVETT Inc.
- Montrose Air Quality Services
- MP Environmental Services, Inc.
- NRC Environmental Services
- Olympic Environmental Equipment, LLC
- Oregon Department of Environmental Quality
- Pace National
- Pacific Coast Carbon
- PBS Engineering & Environmental
- Pine Environmental
- PNE dba CCS
- PPV, Inc.
- Rain for Rent
- River City Environmental
- SGS North America Inc.
- SoilFreeze, Inc.
- SPECTRA Laboratories
- Steadfast Services Northwest, LLC
- Stericycle Environmental Solutions
- Stoel Rives
- StormwateRx LLC
- The L&R Group
- Titus Industrial Group, Inc.
- TRC Environmental
- Triverus, LLC
- TSI Inc.
- United Rentals Fluid Solutions
- Vista Analytical Laboratory
- Wapato Valley Mitigation & Conservation Bank
- WasteXpress Environmental
- WaterTectonics
- Wood Environment & Infrastructure Solutions, Inc.
- Yellow Jacket Drilling Services LLC