Headquartered in Laramie, Wyoming, Trihydro provides public and private clients with a full range of environmental and engineering services. The firm was founded in 1984 and has grown into a successful organization of more than 550 employees with 22 offices and support staff nationwide. Trihydro is often recognized as one of the top engineering firms in the U.S. because of our safety programs, quality of work, and overall responsiveness.