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- Michael Baker Corp.
Austin, Borger, Denton, Houston
- Battelle
Houston
- BE & K
Houston
- Bechtel Corporation
Houston, Sugar Land
- R.W. Beck
Austin, Fort Worth, Richardson, San Antonio
- Benham Companies, LLC
Arlington, Houston
- Louis Berger Group, Inc.
Pearland
- Black & Veatch
Austin, College Station, Dallas,
Houston, San Antonio
- Bloc Design Build
Longview
- BMT Designers & Planners, Inc.
Houston
- Bodycote Materials Testing
Houston
- Booz Allen Hamilton Inc.
Dallas, Houston, San Antonio
- Brown and Caldwell
Austin, El Paso, Houston
- Bucher, Willis & Ratliff Corp.
Anna, Cedar Hill, Dallas, Round Rock, Tyler
- Burns & McDonnell
Fort Worth, Houston
- BW Technologies Ltd.
Arlington
- Caldwell Engineering
Austin, Houston, Richardson
- CALIBRE Systems, Inc.
Camp Bullis, Camp Mabry, Fort Hood
- CAM Environmental Services
Dallas, Nederland, Pasadena
- Cambridge Systematics, Inc.
Austin
- Cameron-Cole, LLC
Houston
- CAPE Inc.
Houston, San Antonio
- Carollo Engineers
Austin, Dallas, San Antonio
- Carter & Burgess Inc.
Arlington, Austin, Dallas,
Fort Worth, Houston, San Antonio
- CCC Group, Inc.
San Antonio
- CDM
Austin, Dallas, El Paso, Fort Worth,
Houston, San Antonio
- CEI
Dallas, Stafford
- CH2M Hill
Austin, Dallas, El Paso, Fort Worth,
Houston, San Antonio, Temple
- Chase Environmental Group, Inc.
Tomball
- Chiang, Patel & Yerby, Inc.
Austin, Dallas, Fort Worth,
Houston, McKinney, San Antonio
- C-K Associates, Inc.
Houston
- Clean Air Engineering, Inc.
Houston
- Clean Harbors, Inc.
Altair, Austin, Dallas, Houston,
La Porte, Port Arthur, San Antonio
- Coler & Colantonio, Inc.
Houston
- Columbia Analytical Services, Inc.
Houston
- Concurrent Technologies Corp.
Temple
- Conestoga - Rovers & Associates
Austin, Farmers Branch, Houston, Midland
- Corrigan Consulting, Inc.
Houston
- R.C. Costello & Associates, Inc.
The Woodlands
- Cubellis Inc.
Dallas
- Delta Environmental Consultants, Inc.
Austin, Carrollton, Fort Worth, Houston, Plano
- DMJM Harris
Austin, Dallas, Houston, Pflugerville
- Dynamac Corp.
Fort Hood
- Texas Companies: E - I, J - R, S - Z.
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