OTHON is certified as a Small Business Enterprise with the Metropolitan Transit Authority of Harris County and the Port of Houston Authority.  Through the Texas Unified Certification Program, OTHON is certified as a Minority/Disadvantaged Business Enterprise with the City of Houston, Texas Department of Transportation, and the North Texas Tollway Authority. OTHON is certified as a Historical Underutilized Business (HUB) through the State of Texas.

OTHON is precertified with the Texas Department of Transportation in several work categories, which include environmental, schematic, roadway and bridge design, hydrology/hydraulics, and construction management services.