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O’Brien Engineering, Inc. (OEI), a Professional design firm specializing in architectural, engineering, and surface water resources analysis and design, 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, and private citizens. We are an SDVOSB and Texas HUB firm.

  • Certified CVE SDVOSB firm (DUNS 790794960)
  • Certified CVE SDVOSB joint venture: OEI-LBL Joint Venture, LLC (DUNS 080886270)
  • SDVOSB joint venture: OEI-Etegra Joint Venture 1, LLC (DUNS 117007790)
  • COMING SOON! Recently approved through the SBA’s All Small Program!! SDVOSB joint venture: OEI-AECOM Mentor Protégé
  • SBE status through the TxDOT certification process since 2016

Download a copy of our SBE Certificate

  • Registered in the System for Award Management (
  • DUNS number 790794960
  • CAGE code 1XVZ8

OEI successfully coordinates regulatory compliance processes with agencies such as the Federal Emergency Management Agency (FEMA), Natural Resources Conservation Service (NRCS), United States Army Corps of Engineers (USACE), Environmental Projection Agency (EPA), Departments of Transportation (DOT), and Commissions on Environmental Quality (such as TCEQ).

Prepared and Knowledgable 

OEI is ready to take on your project. Contact us today to learn how our experienced and certified professionals can provide design, analysis, and/or studies and project management and construction phase services to ensure your project adheres to multiple regulatory agency requirements to avoid budget overruns and project delays. From sustainable and ethical surface water resources analysis and design to site-specific challenges, OEI has the experts, experience, qualifications, and certifications to streamline approvals with federal, state, and local agencies and project stakeholders.