Sioux City: 712-252-5132

Serving the Tri-State Area

Certified Testing Services Inc - Logo

Storm Lake: 712-213-8378

Portland concrete

Concrete is one of the most commonly used materials in construction. With over 30 years of experience, Certified Testing Services Inc can provide you with quality assurance measurements to answer that critical question. Our certified technicians can provide onsite testing, as well as batch plant testing to assure that the project specifications are being met.


Having worked on some of the largest projects in Sioux City and the state of Iowa, we're able to accommodate any job – large or small. You can trust our certified concrete technicians who always use their best judgment during supervision.

Commonly used Portland cement concrete

Concrete quality assurance

CTS can perform testing on regular weight structural concrete, lightweight concrete, and paving concrete. You can count on us for full-time and on-call basis services, and we can even perform specialized testing for that unique project.

Certified personnel for your concrete services

Concrete analysis services

  • Mix design

  • Production testing and inspection

  • Compressive strength tests

  • Flexural strength tests

  • Iowa DOT-certified plant inspection

  • Diamond bit coring

Call our family-owned and operated business for your concrete needs today!

Sioux City:


or Storm Lake:


Portland concrete work