Sioux City

Sioux City Location

Certified Testing Services, Inc.

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Physical Address:

Mailing Address:

PO Box 1193

419 W 6th St.

Sioux City, IA 51102

Mon - Fri: 7:00 am - 5:00 pm
Sat - Sun: Closed

Saturday and Sunday Hours By Appointment Only

Holiday Hours

Monday, May 27, 2024 : Closed
Thursday, July 4, 2024 : Closed
Monday, September 2, 2024 : Closed
Thursday, November 28, 2024 : Closed
Wednesday, December 25, 2024 : Closed
Wednesday, January 1, 2025 : Closed

Main Phone: (712) 252-5132

Fax: (712) 252-0110

Sioux City LOCATION

(712) 252-5132

Location Details

Serving locations in Iowa, Nebraska, South Dakota, and Minnesota. Click here for more details.

Storm Lake LOCATION

1330 Michigan St

Storm Lake, IA 50588

(712) 213-8378

Location Details

Business Hours

Mon - Fri: 7:00 am - 5:00 pm
Sat - Sun: Closed

Saturday and Sunday Hours By Appointment Only

Serving locations in Iowa, Nebraska, South Dakota, and Minnesota. Click here for more details.

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