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- Natural Resource Group, LLC
Houston
- Neel - Schaffer, Inc.
Fort Worth, Plano
- NorthAmerican Services Group
Flint
- Nova Consulting Group, Inc.
Dallas, Tomball
- NSF International
Waco
- OHC Environmental Engineering, Inc.
Brooks City Base
- Oller Engineering, Inc.
Fort Worth, Lubbock
- Operational Technologies Corp. (OpTech)
San Antonio
- Outdoor School
Marble Falls
- Pace Analytical Services, Inc.
Houston
- Parsons
Austin, Dallas, Fort Worth, Houston, San Antonio
- Parsons Brinckerhoff
Austin, Dallas, Houston, San Antonio
- PBS&J
Austin, Dallas, Houston, Pflugerville,
San Antonio, The Woodlands, Tyler
- Pine Environmental Services, Inc.
Houston
- Malcolm Pirnie
Austin, Dallas, El Paso, Fort Worth,
Houston, San Antonio
- Portage, Inc.
San Antonio
- Power Engineers, Inc.
Houston
- Professional Service Industries, Inc.
??
- QORE Property Sciences
Dallas
- Quadrant Consultants Inc.
Houston
- Quantitative Environmental Analysis, LLC
Austin
- Raba - Kistner
Austin, Brownsville, El Paso, Houston,
McAllen, Pflugerville, San Antonio
- Regulatory Compliance Partners
Houston
- Reynolds, Smith and Hills, Inc.
Austin, Houston, San Antonio
- Rimkus Consulting Group, Inc.
Austin, Corpus Christi, Houston,
Irving, McAllen, San Antonio
- RMT, Inc.
Austin, Corpus Christi, Houston, Nederland
- Texas Companies S - Z.
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