- W & W Engineering
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- Waldo & Assoc
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- Washington Group Intl
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- Water Management Svc
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- Waterman-Douglass & Assoc Pllc
- Watermark Engineering LLC
- Watershed Consulting
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- Watertechnology Services
- Wayne A Knoll
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- Weaver Engineering Inc
- Welborn Engineering
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- Welford Engineering Assoc Inc
- Well Test Solutions
- West Mountain Engineering
- West Plains Engineering Inc
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- West Virginia Engineering Co
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- West Welch Reed Engineering
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- Whaley Engineers
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- Williamson Petroleum Conslnts
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- YAHSGS
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- Yarrow Associates
- Zachry Project Mgmt & Constlg
- Zande-Jon Guerry Taylor Inc
- ZDS Design & Consulting Svc
- Zero Risk
