| Owl Ridge Natural Resource Consultants, Incorporated | Anchorage | AK | Subcontractor |
| Oxbow Associates, Inc. | Boxborough | MA | $0 |
| Ox Pond Industries Inc. | Ashburn | VA | $0 |
| Pacific Coastal Research & Planning | Saipan | MP | $0 |
| Palmetto Emergency Management And Environmental Consulting LLC | Fredericksburg | VA | Subcontractor |
| Pandey Environmental, LLC | Dublin | OH | $0 |
| Panhandle Geotechnical & Environmental Inc. | Scottsbluff | NE | $0 |
| Panorama Pathways | Boulder | CO | $0 |
| Par Environmental Services Inc. | Sacramento | CA | $0 |
| Pari & Gershon Incorporated | Turlock | CA | $0 |
| Paso Pacifico | Ventura | CA | $0 |
| Passaro Environmental Assoc | Lakewood | NJ | $0 |
| Past Peoples Consulting, LLC | Flagstaff | AZ | $0 |
| Patricia Torres | Comer | GA | $0 |
| Paul Carpenter Associates, Inc. | Florham Park | NJ | Subcontractor |
| PCR Environmental Inc. | Barrigada | GU | Subcontractor |
| Peel Jennifer | Fort Collins | CO | $0 |
| Pelagic Reasearch Group LLC | Honolulu | HI | $0 |
| Peter Ernest Wigand | Reno | NV | $0 |
| Pgeostat LLC | Jerome | MI | Subcontractor |
| Pinchin, LLC | Berkley | MI | Subcontractor |
| Pinnacle Ecological, Inc. | Delray Beach | FL | $0 |
| Planning Communities, LLC | Raleigh | NC | Subcontractor |
| Plateau Inc. | Montrose | CO | $0 |
| PMC Carib Environmental Consultant LLC | San Juan | PR | Subcontractor |
| P. M. Environmental, Inc. | Marshfield | MA | Subcontractor |
| Porter Scientific, Inc. | Pembroke | NC | Subcontractor |
| Poz Environmental, LLC | Bear Creek Township | PA | $0 |
| PPM Consultants Inc. | Monroe | LA | $0 |
| Practice Greenhealth | Reston | VA | $0 |
| Prairie Environmental Consulting LLC | Sioux Falls | SD | Subcontractor |
| Prairie Wildlife Research, Inc. | Stevens Point | WI | $0 |
| Precision Environmental Inc. | Long Island City | NY | $0 |
| Premier Facility Management Corp. | Woodland Park | NJ | Subcontractor |
| Princeton Geoscience Inc. | Princeton | NJ | Subcontractor |
| Privacom Ventures Inc. | Columbia | SC | $0 |
| Professional Environmental Consulting, Inc. | Knoxville | TN | $0 |
| Professional Technical Support Services Inc. | Baton Rouge | LA | Subcontractor |
| Prospect Hill Consulting LLC | Buffalo | NY | Subcontractor |
| Prospective Technology Inc. | Marriottsville | MD | Subcontractor |
| Providence Engineering And Environmental Group LLC | Baton Rouge | LA | $0 |
| Purtec Inc. | Las Vegas | NV | $0 |
| P.w. Grosser Consulting Engineer & Hydrogeologist, D.P.C. | Bohemia | NY | Subcontractor |
| Pw Grosser Consulting Inc. | Bohemia | NY | Subcontractor |
| Pyron Environmental, Inc. | Olympia | WA | Subcontractor |
| Qc Laboratories, Inc. | Houston | TX | $0 |
| Quality Environmental Solutions & Technologies, Inc. | Wappingers Falls | NY | $0 |
| Quantum Water Consulting LLC | Golden | CO | Subcontractor |
| R4 Federal, Inc. | Manhattan | KS | Subcontractor |
| R & A Consultants Corp. | El Paso | TX | $0 |
| Radiation Safety Services, Inc. | Morton Grove | IL | $0 |
| Randall Hauser | Redding | CA | $0 |
| Rangeland Fire Specialists, LLC | Orlando | OK | $0 |
| Ranger Environmental Services LLC | Austin | TX | $0 |
| Rare Earth Science, LLC | Gunnison | CO | $0 |
| Rcquinn Consulting Inc. | Charlottesville | VA | Subcontractor |
| Reforesta, Inc. | San Juan | PR | $0 |
| Reliable Environmental Solutions, Inc. | Springfield | IL | Subcontractor |
| Remdox, Inc. | Los Angeles | CA | $0 |
| Remedy Engineering, Inc. | Redding | CA | Subcontractor |
| Renewable Resource Solutions LLC | Crystal Falls | MI | $0 |
| Resn Environmental Consulting LLC | Fanwood | NJ | Subcontractor |
| Resource Recycling Systems Inc. | Ann Arbor | MI | Subcontractor |
| RGB Consulting Inc. | Melrose | MA | $0 |
| Rheagua, LLC | Albuquerque | NM | $0 |
| Ridolfi Inc. | Seattle | WA | $0 |
| Rivers Consulting Inc. | Odessa | FL | Subcontractor |
| Robertson-bryan, Inc. | Rancho Cordova | CA | $0 |
| Rocky Mountain Institute | Boulder | CO | Subcontractor |
| Rocky Mountain Tree-ring Research, Inc. | Fort Collins | CO | $0 |
| Rosselot Kirsten S | Calabasas | CA | $0 |
| Roux Associates, Inc. | Hauppauge | NY | Subcontractor |
| Royal Scientific Society | Amman | | Subcontractor |
| R.s. Webb & Associates, Inc. | Holly Springs | GA | $0 |
| Rubik Environmental Inc. | Reno | NV | $0 |
| Ruf Company LLC | Flemington | NJ | Subcontractor |
| Rural Community Assistance Partnership Incorporated | Washington | DC | $0 |
| Rural Water Association Of Arizona | Maricopa | AZ | Subcontractor |
| Safety Tech Inc. | Oklahoma City | OK | Subcontractor |
| Sand County Environmental Inc. | Rhinelander | WI | $0 |
| Sanders Environmental Inc. | Bellefonte | PA | Subcontractor |
| Sca Environmental, Inc. | San Francisco | CA | Subcontractor |
| Scissortail Environmental Solutions, LLC | Ada | OK | $0 |
| Second Nature Inc. | Cambridge | MA | Subcontractor |
| See Botanical LLC | Bellingham | WA | Subcontractor |
| Sensor Environmental LLC | Sunnyvale | CA | Subcontractor |
| Separation Systems Consultants, Inc. | Houston | TX | $0 |
| Silver Wolf Environmental, Inc. | Shoreham | NY | $0 |
| Sinnott Portia | Sebastopol | CA | Subcontractor |
| Ska Consulting LP | Houston | TX | $0 |
| Smart Consulting LLC | Clinton | MT | $0 |
| Sme Environmental, Inc. | Durango | CO | $0 |
| Smith Charles Robert | Freeville | NY | $0 |
| Smith River Watershed Council | Reedsport | OR | $0 |
| Smultea Environmental Sciences LLC | Preston | WA | Subcontractor |
| Sociedad Ambiente Marino Inc. | San Juan | PR | $0 |
| Soclaris Contracting | La Mesa | CA | Subcontractor |
| Soil Exploration Services Inc. | Fort Wayne | IN | Subcontractor |
| Soli Technical, LLC | Denver | CO | $0 |
| Solstice Alaska Consulting Inc. | Anchorage | AK | $0 |
