Quality, Service & Commitment


  • 26 Oct 2017

    INTERRA To Host Ribbon Cutting With Bolingbrook Mayor Celebrating Going Green

  • 21 Jul 2017

    Recipient Of Service Award Thanks INTERRA for Engineering Support With Jane Byrne Circle Interchange

  • 15 Mar 2017

    INTERRA, Inc. Full-Time Field Technician Openings in Franklin, WI

More News


Laboratory Certifications

  • IL & WI State DOTs
  • ASTM


Firm Certifications

  • DBE with IDOT
  • MBE with City of Chicago

Read More


With this letter we provide our confidence in INTERRA in providing comprehensive field and laboratory testing for projects involving soils investigations, design and construction monitoring … Their services are consistently ontime and within budget…

Read More


INTERRA’s full service materials testing laboratories are among the finest and most respected in the Midwest.  Our proprietary data management system provides up-to-date information regarding testing status, performs thorough quality control procedures, and allows clients to access test reports online. The quality of work performed by INTERRA is further demonstrated by the certifications we possess from various regulatory agencies.  Please visit agency websites for scope of accreditation and accredited methods or prequalification categories for each of our laboratories.

  • American Association of State Highway & Transportation Officials (AASHTO)
  • Illinois Department of Transportation (IDOT)
  • Indiana Department of Transportation (INDOT)
  • Michigan Department of Transportation (MDOT)
  • Wisconsin Department of Transportation (WISDOT)

Interra is certified as Minority/Disadvantaged Business Enterprise (M/DBE) by the following Agencies:

  • Illinois DOT (IDOT)
  • Indiana DOT (INDOT)
  • Michigan DOT (MDOT)
  • Wisconsin DOT (WisDOT)
  • City of Chicago
  • State of Illinois
  • State of Wisconsin