About

Certified Testing Services, Inc provides geotechnical drilling, geotechnical engineering, construction material testing, aggregate inspections, and soil testing in the Sioux City and Storm Lake, IA, areas.

Year Established

1987

Products

Services

• Concrete Testing
• EPS Expanded Polystyrene Fill Testing
• Fire Proofing Inspection
• Hot Mix Asphalt Testing
• Mineral Aggregates
• Portland Cement Testing
• Soil Testing

Specialties

• Construction Material Testing
• Geotechnical Drilling
• Geotechnical Engineering

Business Hours

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

Associations

Brands

Pickup and Delivery

Payment Options

• Cash
• Check
• MasterCard
• Visa

• ACH Payments

Languages

• English

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