Name of Company | Contact | City | State | Phone |
| Air Resource Specialists, Inc. | Howard Gebhart | Fort Collins | CO | 970-484-7941 |
| Air Pollution Testing, Inc. | David Maiers | Arvada | CO | 303 420-5949 |
| American Engineering Testing, Inc. | Brad Palmer | Pierre | SD | 605-224-9535 |
| SCS Aquaterra Environmental Solutions, Inc. | Mike Miller | Omaha | NE | 402-884-6202 |
| BE&K/Terranext | Steve Peck | Lakewood | CO | 303-914-1700 |
| BEM Systems, Inc. | Greg Butler | Kansas City | MO | 816-842-7440 |
| Burns & McDonnell | Jim Foil | Kansas City | MO | 816-822-3180 |
| Clayton Group Services, Inc. | Derek Wong | Novi | MI | 248-344-2661 |
| Clean Air Engineering | Jim Pollack | Palatine | IL | 847-991-3300 |
| Conestoga-Rovers & Associates | Neil Leipzig | Omaha | NE | 402-778-4804 |
| Cooper Engineering, P.C. | John W. Cooper | Lincoln | NE | 402-483-5489 |
| Coranco Great Plains, Inc. | Dan Blankenau | Wahoo | NE | 402-443-4340 |
| Ecology & Environmental, Inc. | John Caoile | Overland Park | KS | 913-432-9961 |
| Eneco Tech | John Lynch | Denver | CO | 303-861-2200 |
| ENSR Corporation | Wayne Lindsay | Ballwin | MO | |
| Enviroplan Consulting | Sangeetha Balakrishnan | Fairfield | NJ | 973-575-2555 |
| Franklin Associates/McLaren/Hart, Inc. | David E. Brewer | Prairie Village | KS | 913-649-2225 |
| Golder Associates, Inc. | Dean Rector | Lakewood | CO | 800-235-7784 |
| Hanson Professional Services, Inc. | Curt Krueger | Kansas City | MO | 816-701-3102 |
| Harding ESE | Tom Colwell | Lincoln | NE | 402-421-7755 |
| HDR Engineering | Tim Crockett | Omaha | NE | 402-399-1257 |
| IT Corporation | Doug Trail | Urbandale | IA | 515-252-0234 |
| MACTEC Engineering & Consulting, Inc. | Tom Colwell | Lincoln | NE | 402-421-7755 |
| METCO Environmental, Inc. | Mike Hutcherson | Carrollton | TX | 800-394-1194 |
| Natural Resource Group, LLC | Todd Potas | Minneapolis | MN | 612-347-6789 |
| Nebraska Air Quality Specialties, LLC | Piyush Srivastav | Garland | NE | 402-310-5321 |
| Olsson Environmental Sciences, Inc. | Jeffrey S. Johnson | Lincoln | NE | 402-474-6320 |
| Pace Analytical Services, Inc. | Blane Wood | Lenexa | KS | 913-563-1452 |
| Pace Analytical Services, Inc. | Thomas Halverson | Minneapolis | MN | 612-607-6398 |
| Pollution Prevention International, Inc. | Bahman Rohanizadeh | Irvine | CA | 949-757-2690 |
| Professional Environmental Solutions | Vaden Hellerich | Valparaiso | NE | 402-817-3942 |
| RK & Associates, Inc. | Suresh Relwani | Warrenville | IL | 603-393-9000 |
| Roy F. Weston, Inc. | Rodney Kirch | Vernon Hills | IL | 847-918-4149 |
| Stanley Consultants, Inc. | Mick Durham | Coralville | IL | 319-626-3990 |
| Terracon | David M. Svingen | Omaha | NE | 402-330-2202 |
| TestAmerica, Inc. | Mike McGee | Cedar Falls | IA | 800-750-2401 |
| Trinity Consultants | Don Gansert | Olathe | KS | 913-390-9700 |
| Tri State Environmental Services, Inc. | Mark O'Harrow | Sioux City | IA | 712-276-2854 |
| URS Corporation | Christie Kampschneider | Omaha | NE | 402-334-8181 |
| WLA Consulting, Inc. | Brian Mulinix | Lincoln | NE | 402-475-8588 |
| WLA Consulting, Inc. | Fred Scarpello | Omaha | NE | 402-991-5833 |