Caltrans Statewide Independent Assurance Database (SIAD)

Need to verify the certifications of material testers and labs?

The Statewide Independent Assurance Database (SIAD) is a web application that serves as a central repository for statewide Independent Assurance (IA) data pertaining to IA staff, testing personnel, and laboratories.  The SIAD provides instant access to statewide IA accreditations, certifications and proficiencies.

Search Labs and Testers on the SIAD

For more information about the Caltrans Independent Assurance Program (IAP), please see the Independent Assurance Manual and associated documents on the IAP webpage.