- Anadarko Petroleum Corporation
- Apache Corporation
- Apache Shores Utility Corp.
- Aransas Natural Gas Company
- Associates Utilities
- Baker Botts, L.L.P.
- Bayou Vista Utilities
- Beck, Redden & Secrest
- Berry Creek Water Co.
- Big Eddy Water Co.
- BP America Production Company
- Bruner, Jamieson & Pappas, L.L.P.
- Bulverde Utilities
- Cabot Oil & Gas
- Canon, Gaston & Strain, L.L.P.
- Cardwell, Hart & Bennett, L.L.P.
- Chesapeake Energy Corporation
- Chevron Corporation
- City of Fort Worth
- City of Longview
- City of Sherman
- City of Tyler
- City of Wichita Falls
- CMS Texas LLC
- Cody Energy LLC
- ConocoPhillips
- Dale Operating Company
- Dernick Resources, Inc.
- Devon Energy Corporation
- Douglas Utilities
- ExxonMobil Corporation
- Forest Glen Utility Co.
- Gable & Gotwals
- Glenlake Water System
- Graham & Associates, Inc.
- Gulf Utilities
- Hanlon Gas Processing, LTD
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- Hays & Owens, L.L.P.
- HCH Water Co.
- Hill Country Utility Co.
- Hill Country Water Works
- Hi-Texas Water Corporation
- Holiday Oaks Water Co.
- Holly Ranch Water Co.
- Industrial Utility Services
- James E. Smith & Associates, Inc.
- Kelly, Hart & Hallman
- Kinder Morgan, Inc.
- Lackland City Water Co.
- Lake Vista Water Co.
- Lake Whitney Water Co.
- MB Exploration, L.L.C.
- McAfee & Taft
- McClymond, Ltd.
- MHI Water Co.
- Mitchell County Utility
- Oakridge Water Co.
- Pine Mountain Oil and Gas, Inc.
- River Oaks Water System
- Sage Energy Company
- Scott, Douglass & McConnico, L.L.P.
- Shell Oil Company
- Spicewood Development
- Southern Utilities
- Sunbelt Utilities
- Technology/Hydraulics
- Tecon Water Company, L.P.
- Texaco Exploration & Production, Inc.
- Texas Resort Utilities
- Unocal
- Vamos Oil & Gas, LLC
- W&T Offshore, Inc.
- Woodcreek Utilities
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