Terracon Consultants, Inc. Engineering Terracon Consultants, Inc. Visit Website 11555 Clay Rd., Ste.100 Houston, TX 77043 (713) 690-8989 About Map About Terracon Consultants is national, employee-owned specializing in environmental, geotechnical, construction materials & engineering testing and facilities observations. What's Nearby? Distance: 5 10 15 20 25 50 mi.