- Arcadis U.S. Inc.
- AECOM
- CH2M Hill
- Department of the Army, Corps of Engineers
- EA Engineering Science & Technology, Inc.
- EHS Support
- Environ
- ERM
- Fluor-Daniel, Inc.
- FPL Energy
- General Electric Company
- Geosyntec Consultants
- GeoTrans, Inc..
- Halliburton NUS Corp.
- ICF Consulting, Inc.
- Intel Corp.
- IBM Corporation
- International Paper
- Jack Moore Associates
- Jacques Whitford Company, Inc.
- Langan Engineering and Environmental Services, Inc.
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- Loitherstein Environmental Engineering, Inc.
- Louis Berger International, Inc.
- McCulley Frick & Gilman, Inc.
- Metcalf & Eddy, Inc.
- North Atlantic Energy Service Corporation
- Ocean State Power
- Professional Service Industries (PSI)
- RADIAN Corporation
- Rizzo Associates, Inc.
- Shaw E&I, Inc.
- Surveying and Mapping Consultants, Inc. (SMC)
- Tata & Howard, Inc.
- TetraTech EM, Inc.
- Tighe & Bond, Inc.
- TRC Environmental
- URS Corporation
- Vanesse Hangen Brustlin, Inc.
- Weston & Sampson Engineers
- Williamson Environmental
- Woodward & Curran Environmental Services, Inc.
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