- Alliance Exploration
- ARCO
- B. T. U.
- B. W. O. C., Inc.
- Brazos Resources Corporation
- BreitBurn Energy Partners
- Brushy Water Supply Corp.
- CFS Financial Services
- City of Arlington
- City of Bryan
- City of College Station
- Conoco
- Dart Oil & Gas
- Delhi Pipeline Company
- Devon Energy Corp.
- Duke Energy Field Services, L.P.
- EOG Resources
- Entergy
- Freese and Nichols Engineering
- Getty Oil & Gas
- GSI Oil and Gas, Inc.
- Gulf States Utilities
- H. E. A. Exploration Company
- Houston Lighting and Power
- Kerr McGee
- Kling Engineering
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- Lone Star East One, LLC
- Lone Star Gas
- Main Street Homes
- Malcolm Pirnie Engineering Co.
- Marshall Exploration
- Millican Oil Company
- Mobil
- Newfield Exploration Inc.
- OSR Water Supply Co.
- Prodeco Exploration Company
- Pro Tech Operating, Inc.
- Rabon Metcalf Engineering Co.
- Shell E & P Co.
- Sklar & Phillips
- Sonat Exploration, Inc.
- Sonerra Resources Corp.
- Southwest Gas & Pipeline
- Texaco
- Texas Utilities
- The Louisiana Land and Exploration Company
- The United States Department of Justice
- United Oil & Minerals,
- Wellborn Special Utility District
- Williams Exploration & Production
- XTO
- EnerVest
- Clipper
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