Sioux City: 712-252-5132

Serving the Tri-State Area

Certified Testing Services Inc - Logo

Storm Lake: 712-213-8378

Sioux Falls

Phone: 712-252-5132


Fax: 712-252-0110


Our Office:

Certified Testing Services Inc

419 W 6th Street

Sioux City, IA 51102


Mailing Address:

PO Box 1193

Sioux City, IA 51102


Business Hours:

Monday - Friday: 7:00 AM - 5:00 PM


Please see our staff page for names and descriptions of the employees at our Sioux City, IA office.

Stop by or call our Sioux City office today

sccl logo