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OEI, a Professional Engineering firm, is registered in Texas (TBPE firm #F-3758), Oklahoma, Arizona, Utah, Louisiana, and Wisconsin.  OEI is also registered as an Architectural firm in Texas (TBAE firm #BR3993). We serve Federal and State government, Municipal, Developers, A/E firms, Industry. We are an SDVOSB and Texas HUB firm.

Coordination with Regulatory Agencies is an integral part of our projects. Such agencies include Federal Emergency Management Agency (FEMA), Natural Resources Conservation Service (NRCS), United States Army Corps of Engineers (USACE), Environmental Projection Agency (EPA), Department of Transportation (DOT), and Commissions on Environmental Quality (such as TCEQ).

  • OEI is a certified CVE SDVOSB firm (DUNS 790794960)
  • OEI has a certified CVE SDVOSB joint venture: OEI-LBL Joint Venture, LLC (DUNS 080886270)
  • OEI has an SDVOSB joint venture: OEI-Etegra Joint Venture 1, LLC (DUNS 117007790)

OEI is certified as a HUB firm through the State of Texas’ HUB program.  Download a copy of our HUB certificate.

OEI obtained SBE status through the TxDOT certification process in 2016.  Download a copy of our SBE Certificate

  • OEI is registered in the System for Award Management (
  • DUNS number 790794960
  • CAGE code 1XVZ8
  • Land Planning / Engineering (1.4.1)
  • Minor Roadway Design (4.1.1)
  • Bicycle & Ped Facility Dev (9.1.1)
  • Hydrologic Studies (10.1.1)
  • Basic Hydraulic Design (10.2.1)
  • Complex Hydraulic Design (10.3.1)
  • Pump Stations / Hydraulics (10.4.1)
  • Roadway Const Mgmt & Inspection (11.1.1)
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