Chicago Testing Labs
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Since 1912, the name Chicago Testing Laboratory has been synonymous with the word trust. People place immense confidence in CTL for quality control and quality assurance of asphalt and asphalt materials, liquids, aggregates, concrete and soils. Our vision is to become your preferred engineering and construction management partner by providing “best-in-class” testing, inspection, training, consulting and research. A high degree of professionalism and impeccable customer service has earned CTL a rock-solid reputation nationwide. Our belief is that by doing business with integrity, we will continue to enjoy great success. Services and Accreditations

Chicago Testing Laboratory is proud to have a rich heritage and history contributing to the success of the construction materials industry here in the midwest and nationwide.  CTL history includes over a century of expertise and experience in construction materials, a sampling of our accomplishments and benchmarks are included here:  CTL History