INTERRA is an industry leading provider of the following services:

Agency Prequalified. INTERRA is prequalified by the Illinois Department of Transportation in the following categories:

  • Geotechnical Services – General Geotechnical Services
  • Geotechnical Services – Structure Geotechnical Reports
  • Geotechnical Services – Subsurface Explorations
  • Special Services – Quality Assurance PCC & Aggregate
  • Special Services – Quality Assurance HMA & Aggregate
  • Special Services – Construction Inspection
  • Airports – Construction Inspection

NAICS Codes

  • 541330 – Engineering Services
  • 541380 – Testing Laboratories