- Air Metrics
- Air Systems
- Alternative Energy
- ATC Associates
- Benchmark
- Berlogar Geotechnical
- Block Environmental
- Brelje & Race
- Brunsing Associates
- Carlenzoli & Associates
- Carlile Macy
- CH2M Hill
- Clark Seif Clark Environmental
- Clayton Group Services
- Coastland Civil Engineering
- Cohen Group
- Denali Group
- EBA Waste Technologies
- ENSR International
- Environmental Data Solutions Group
- Environmental Engineering Associates
- Erler & Kalinowski
- ERM
- Exponent
- Frye Environmental
- GC Environmental
- Green Valley Consulting Engineers
- HazMat Solutions
- Hogan Land Services
- IHI Environmental
- Indoor Air Diagnostics
- Indoor Environmental Engineering
- J.M. Turner Engineering
- Kellco Services
- Kleinfelder
- Marina Mechanical
- Martin Consulting
- MKM & Associates
- North Bay Permit Services
- NRC Environmental Services
- Prunuske Chatham
- Quattrocchi Kwok Architects
- SCA Environmental
- SCS Engineers
- Restoration Consultants
- RGA Environmental
- RGH Geotechnical & Environmental
- RHL Design Group
- Ruzicka Associates
- Winzler & Kelley