Agrifos Fertilizer, L.P.
Air Liquide America Corp.
Albemarle Corp.
Alcoa, Inc.
Alstom Power
Armstrong Cement
Biegler
Black & Veatch
Braden Manufacturing
British Petroleum (BP)
Capitol Cement
Cargill
CDI Engineering Group
Cemex
Citgo
CMC Steel Texas (formerly SMI)
Dearborn Midwest Conveyor Co.
Drake Cement LLC
Drummond Company
Elementis
Essroc Materials

Exxon Company USA
Flint Hills (formerly Koch Refining)
Florida Rock Industries
Fluor
General Electric (G.E.)
Graymont
Gulf Marine Fabricators
IMC Phosphate Co.
Invista
Kennecott Utah Copper
Keystone Cement Company
Kinder Morgan
Luminant (formerly TXU Energy)
Mannesmann Demag Delaval
MIM Holdings
Mobil Chemical Co.
Mosaic
National Gypsum
Neundorfer 
North American Coal Co. 

Oxy Vinyls, L.P.
PCS Phosphate Co.
Peabody Energy
Port of Brownsville
Port of Corpus Christi
Praxair
Rhodia
Seadrift Coke LP
Shell
Sherwin Alumina Co. (formerly Reynolds Metals Co.)
Sid Richardson Carbon Co.
Southern Company
Texas Dept. of Criminal Justice
Texas Industries, Inc.
Texas Lehigh Cement
Metso Texas Shredder, Inc.
U.S. Corps of Engineers
US Gypsum
Valero