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. To that end, we may have a new appearance, but our level of commitment remains the same.