| Florida Three Rivers Resource Conservation And Development Council, Inc. | Milton | FL | $0 |
| Focus Environmental, Inc. | Knoxville | TN | Subcontractor |
| Fosterra, LLC | Saratoga Springs | NY | $0 |
| Four Elements Consulting LLC | Seattle | WA | $0 |
| France Environmental Inc. | Richmond | VA | Subcontractor |
| Frontier Technical Associates, Inc. | Williamsville | NY | $0 |
| Galvin Preservation Associates Inc. | El Segundo | CA | Subcontractor |
| Gel Engineering LLC | Charleston | SC | Subcontractor |
| Geocore, LLC | Salina | KS | Subcontractor |
| Geo Lab, Inc. | Winder | GA | Subcontractor |
| Geosyntec Consultants, Inc.Portland, OR · UEI CEZGGACJH5L5 | Portland | OR | Subcontractor |
| Geosyntec Consultants, Inc.Los Angeles, CA · UEI WCDLFALD62W9 | Los Angeles | CA | Subcontractor |
| Geo-watersheds Scientific, LLC | Fairbanks | AK | $0 |
| Glenn Lukos Associates, Inc. | Santa Ana | CA | $0 |
| Global Environmental Consulting, Inc. | Scottsdale | AZ | Subcontractor |
| Gram Northwest LLC | Richland | WA | Subcontractor |
| Gravity Consulting, LLC | Fall City | WA | Subcontractor |
| Great Lakes Environmental Planning Inc. | Highland Park | IL | $0 |
| Green Arrow, LLC | North Charleston | SC | Subcontractor |
| Green Environmental, Inc. | Rockland | MA | Subcontractor |
| Greenhouse Gas Experts Network, Inc. | Seattle | WA | Subcontractor |
| Green Rock Strategies, LLC | North Charleston | SC | Subcontractor |
| Greenvest LLC | Bowie | MD | $0 |
| Gross Michael | San Rafael | CA | Subcontractor |
| Grows Walter K | Sagle | ID | $0 |
| Gsi Engineering LLC | Wichita | KS | Subcontractor |
| Gsi Mid-atlantic, Inc. | Bel Air | MD | Subcontractor |
| GST Environmental Services Ltd. | Warrendale | PA | $0 |
| Guzek Associates Inc. | Clarks Summit | PA | $0 |
| Hagler Bailly Pakistan (private) Limited | Islamabad | | Subcontractor |
| Hansa Consult Of North America LLC | Portsmouth | NH | Subcontractor |
| Hazcorp Environmental Services, Inc. | Toledo | OH | $0 |
| Hazmat Solutions Inc. | West Olive | MI | $0 |
| HDR Environmental, Operations And Construction, Inc. | Vienna | VA | Subcontractor |
| Helix Environmental, Inc. | Dayton | OH | $0 |
| Heritage Environmental, LLC | Clinton | TN | Subcontractor |
| Heritage Strategies LLC | Spring City | PA | $0 |
| Heron Pacific LLC | Rocklin | CA | Subcontractor |
| Herron Enterprises USA, Inc. | Lakewood | CO | Subcontractor |
| Hicks & Company, Environmental/archeological Consultants | Austin | TX | $0 |
| High Desert Native Plants, LLC | El Paso | TX | Subcontractor |
| High Water Mark LLC | Bernalillo | NM | $0 |
| Hobi International, Inc. | Batavia | IL | $0 |
| Hoffman Jennifer Ruth | Poulsbo | WA | $0 |
| Holistic Wildlife Services Nm, LLC | Yorktown | VA | $0 |
| Hollaway Environmental And Communications Services, Inc. | Houston | TX | Subcontractor |
| Holt Robert M | Oxford | MS | Subcontractor |
| House Of Water And Environment | Ramallah | | Subcontractor |
| Houston Advance Research Center | Spring | TX | $0 |
| H & R Environmental Services Inc. | Bordentown | NJ | $0 |
| HRL Compliance Solutions, Inc. | Grand Junction | CO | $0 |
| HSW Consulting LLC | Tampa | FL | Subcontractor |
| HTH Safety Solutions LLC | Nelsonville | OH | $0 |
| Hub Testing Laboratory, Inc. | Waltham | MA | $0 |
| Huffman-broadway Group, Inc. | San Rafael | CA | $0 |
| Hughes Collaboration | Denver | CO | $0 |
| Hutzel & Associates Inc. | Avondale | AZ | $0 |
| Hydrofocus, Inc. | Davis | CA | $0 |
| Hydro Geo Chem, Inc. | Tucson | AZ | $0 |
| Hydrometrics Inc. | Helena | MT | Subcontractor |
| Hygieneering Inc. | Willowbrook | IL | Subcontractor |
| Hygienix, LLC | Great Falls | MT | Subcontractor |
| Idealeco LLC | Brookshire | TX | Subcontractor |
| Iea Environmental Projects Limited | Cheltenham | | $0 |
| Iecis Group LLC | Stillwater | MN | $0 |
| Ih Services, Inc. | Baltimore | MD | $0 |
| Impact Sciences, Inc. | Los Angeles | CA | $0 |
| Inclusion Consulting LLC | Kailua | HI | Subcontractor |
| Incompli Inc. | Aliso Viejo | CA | Subcontractor |
| Industrial Treatment Of Water LLC | Hillsboro | OR | Subcontractor |
| Inquest Environmental Inc. | Salisbury | MO | Subcontractor |
| Inspire Environmental, Inc. | Newport | RI | Subcontractor |
| Institute For Conservation Leadership, Inc. A/k/a Institute For Conservation Leadership | Greenbelt | MD | $0 |
| Integrity Environmental LLC | Eagle River | AK | $0 |
| Interagency Inc. | Washington | DC | Subcontractor |
| Intrinsyx Environmental Corporation | Sunnyvale | CA | Subcontractor |
| Ivet Environmental, Inc. | San Diego | CA | Subcontractor |
| Ivey Gary | Bend | OR | $0 |
| James Kerr And Associates, LLC | Acton | MA | Subcontractor |
| Janus Research, Inc. | Tampa | FL | Subcontractor |
| Jeff Zunker Specialty Products Inc. | San Antonio | TX | $0 |
| Jennings Environmental PLLC | Asheville | NC | $0 |
| JFK Environmental Services LLC | Gloucester | MA | Subcontractor |
| Jjrose Consulting Group LLC | Peachtree City | GA | Subcontractor |
| Johnson Environmental Technologies, Inc. | Fountain Hills | AZ | Subcontractor |
| Jonathan G Price LLC | Reno | NV | $0 |
| JRM Environmental Inc. | Scottsdale | AZ | Subcontractor |
| Jw Associates Inc. | Breckenridge | CO | $0 |
| Kalimantan Environmental Services, Inc. | Kissimmee | FL | $0 |
| Kam Consultants Corp. | Astoria | NY | $0 |
| Karen Allen | Bend | OR | $0 |
| Kasi LLC | Saipan | MP | Subcontractor |
| Kas Inc. | Williston | VT | Subcontractor |
| Kautz Environmental Consultants Inc. | Reno | NV | $0 |
| K Denton & Associates LLC | Sequim | WA | $0 |
| Kemwest Inc. | Castle Rock | CO | $0 |
| Kenvirons, LLC | Frankfort | KY | $0 |
| Kestrel Consulting Inc. | Hood River | OR | $0 |
| Keystone Restoration Ecology Inc. | Santa Fe | NM | $0 |
| King Consultants, Inc. | Lubbock | TX | $0 |
