| Craig Consultants, Inc. | Murrieta | CA | Subcontractor |
| Cr Environmental, Inc. | East Falmouth | MA | Subcontractor |
| CRG Texas Environmental Services, Inc. | Rosenberg | TX | Subcontractor |
| Cromwell Environmental Inc. | Lawrence | KS | $0 |
| Cs-edgewater 2.0 LLC | Knoxville | TN | Subcontractor |
| Csl-edgewater, LLC | Knoxville | TN | Subcontractor |
| Curtice Griffin | Greenfield | MA | $0 |
| Custom Stack Analysis LLC | Alliance | OH | $0 |
| Cyriacks Environmental Consulting Services Inc. | Deerfield Beach | FL | Subcontractor |
| CZR Inc. | Jupiter | FL | $0 |
| Dagmar Schmidt Etkin | Cortlandt Manor | NY | $0 |
| D.a.s. Consulting Services, LLC | Springfield | IL | $0 |
| Day Environmental, Inc. | Rochester | NY | $0 |
| Decontamination Decommissioning & Environmental Services LLC | Middleton | MA | $0 |
| De Maximis Data Management Solutions, Inc. | Knoxville | TN | Subcontractor |
| Denise Reed LLC | Montegut | LA | Subcontractor |
| Deschutes Basin Native Plant Seedbank | Bend | OR | $0 |
| Dominion Environmental Consultants, Inc. | Phoenix | AZ | $0 |
| Dougherty Sprague Enterprises, Inc. | Rowlett | TX | $0 |
| Dovetail Partners Inc. | Minneapolis | MN | $0 |
| Drayton Archaeological Research LLC | Blaine | WA | $0 |
| E2rc LLC | Bernalillo | NM | Subcontractor |
| E3 Federal Services, Inc. | Woodstock | MD | Subcontractor |
| Eagle Environmental, Inc. | Bristol | CT | $0 |
| Eagle Environmental Services, Inc. | Baton Rouge | LA | $0 |
| Eagle Group U.S.A., Inc. | Troy | MI | $0 |
| Earthcreek, LLC | Atmore | AL | Subcontractor |
| Earth Economics | Tacoma | WA | Subcontractor |
| Earthshift Global LLC | Kittery | ME | $0 |
| Earthshine, LLC | Bethesda | MD | $0 |
| Earth Toxics Inc. | Sandy | UT | Subcontractor |
| East Coast Observers, Incorporated | Norfolk | VA | Subcontractor |
| Eastern Research Group Inc. | Fairfax | VA | $0 |
| Eastern Technical Associates Inc. | Raleigh | NC | $0 |
| Eco49 Consulting LLC | Bend | OR | $0 |
| Ecological Modelling Services Pty Ltd. | Chapel Hill | | $0 |
| Ecological Resource Consultants, Inc. | Panama City Beach | FL | $0 |
| Ecological Risk Inc. | Rancho Murieta | CA | Subcontractor |
| Ecologic Consulting LLC | Kailua | HI | Subcontractor |
| Ecology And Environment Engineering And Geology, P.C. | Buffalo | NY | Subcontractor |
| Ecorx, LLC | Sedona | AZ | $0 |
| Ecosound Bioacoustics, LLC | Santee | CA | $0 |
| Ecosystems Environmental Services, Inc. | Mechanicsville | VA | $0 |
| Ecosystems Management Associates, Inc. | La Jolla | CA | $0 |
| Ecosystems Research Institute, Inc. | Logan | UT | $0 |
| Effective Environmental Restoration (eer), Inc. | Cabo Rojo | PR | $0 |
| Efi Global Inc. | Memphis | TN | Subcontractor |
| Element Environmental Resources LLC | Fort Worth | TX | Subcontractor |
| Endemic Environmental Services Inc. | Fullerton | CA | Subcontractor |
| Energy Saving Foundation | Yerevan | | Subcontractor |
| Engineering, Compliance And Construction, Inc. | Little Rock | AR | $0 |
| Enova D.o.o. Sarajevo | Sarajevo-centar | | Subcontractor |
| Envirobusiness, Inc. | Burlington | MA | $0 |
| Envirocheck, Inc. | Orange | CA | $0 |
| Environeer, LLC | Houston | TX | Subcontractor |
| Environet Inc. | Davenport | IA | Subcontractor |
| Environmental Compliance & Safety, Inc. | Sherman | MS | Subcontractor |
| Environmental Consultants And Contractors, Inc. | Chantilly | VA | $0 |
| Environmental Consultants International, LLC | Houston | TX | Subcontractor |
| Environmental Consulting Services LLC | Denver | CO | Subcontractor |
| Environmental Cost Management, Inc. | West Sacramento | CA | Subcontractor |
| Environmental Data Services Inc. | Palm Beach Gardens | FL | Subcontractor |
| Environmental Data Validation Inc. | Pittsburgh | PA | Subcontractor |
| Environmental Diagnostics Corp. | Marshall | VA | $0 |
| Environmental Engineering & Consulting Services LLC | Tempe | AZ | $0 |
| Environmental Engineering, Inc. | Glendale | CA | $0 |
| Environmental Hazard Control Lab Inc. | Tulsa | OK | $0 |
| Environmental Health Investigations, Inc. | Sparta | NJ | $0 |
| Environmentally Smart LLC | Lincoln | CA | $0 |
| Environmental Management Consulting Inc. | Lake Mills | WI | $0 |
| Environmental Mapping Consultants LLC | Aguadilla | PR | $0 |
| Environmental Regulatory Compliance, LLC | San Bernardino | CA | Subcontractor |
| Environmental Research And Assessment (era) Limited | Cambridge | | Subcontractor |
| Environmental Resources Compliance, LLC | Sacramento | CA | Subcontractor |
| Environmental Resources Group, LLC | Novi | MI | $0 |
| Environmental Restoration Group, Inc. | Albuquerque | NM | Subcontractor |
| Environmental Standards, Inc. | Valley Forge | PA | Subcontractor |
| Environmental Tactics Inc. | Matawan | NJ | $0 |
| Environmental Technical Solutions, LLC | Denver | CO | Subcontractor |
| Environmental Tracing LLC | Saint Augustine | FL | $0 |
| Environmetrics & Statistics Ltd. | Las Vegas | NV | $0 |
| Environova, LLC. | San Francisco | CA | Subcontractor |
| Enviroquest Inc. | Aiea | HI | Subcontractor |
| Enviroresources Inc. | Barranquitas | PR | $0 |
| Envision Cost Solutions LLC | Sumerduck | VA | Subcontractor |
| Erg - Eastern Shawnee JV, LLC | Overland Park | KS | $0 |
| Ergoworks Consulting, L.L.C | North Potomac | MD | $0 |
| Eri Consulting, Inc. | Tyler | TX | $0 |
| Erin Hackney | Frederick | MD | $0 |
| Erm Consulting & Engineering, Inc. | Boston | MA | $0 |
| Ertec, LLC | Rio Piedras | PR | Subcontractor |
| Ese Partners, LLC | Katy | TX | Subcontractor |
| Essco Environmental, Inc. | El Paso | TX | Subcontractor |
| Farallon Consulting, L.L.C | Bellevue | WA | $0 |
| Farmer Environmental Services, LLC | Edwardsville | IL | $0 |
| Fb Environmental Associates, LLC | Portland | ME | $0 |
| Felts, Margaret C | Delta | CO | $0 |
| Fernleaf Interactive LLC | Asheville | NC | Subcontractor |
| Firewater Associates, LLC | Oak Ridge | TN | Subcontractor |
| Five Hundred B Solutions PVT. Ltd. | Lalitpur | | Subcontractor |
