Sioux City: 712-252-5132

Serving the Tri-State Area

Certified Testing Services Inc - Logo

Storm Lake: 712-213-8378

Project Cement work

From residential projects to major commercial projects, Certified Testing Services Inc is your #1 resource for all geotechnical testing and quality control services. You can count on us as we have over 30 years of experience.


To ensure that your construction plans and designs are executed properly, our team completes accurate testing and quality control. Working on a full-time or on-call basis, we will always meet your deadline and provide a fast turnaround time on your reports. We can also create specialized tests for your unique project!

Construction quality control

Customers We Service

  • Commercial and grading

  • GeoTech commercial

  • GeoTech municipal

  • GeoTech road

  • Medical


Sioux City:


or Storm Lake:


Successful construction testing projects

  • Paving and utility

  • Recreational aquatic centers

  • Schools and churches

  • Federal, state, or county funded

  • Subdivisions and apartments