COVID-19 (Coronavirus) situation:

Testing candidates: Check our COVID-19 Update Page to look for testing availability and review the health and safety measures required for testing.

Appointment availability is limited due to social distancing precautions and varies by location. Please note that our customer service wait-times are also longer than usual right now. For information on rescheduling, refunds, and more, please check out our FAQs.

Customer service

ICC has been split into different testing programs on our website. You will need to know the two digit exam code before you can register for your National Certification and UST/AST exam. Each testing program will require a unique username and password. View the current exams list for the National Certification and UST/AST program.

Appointment availability is limited due to social distancing precautions and varies by location. Please note that our customer service wait-times are also longer than usual right now.

Learn more about testing for Essential Services in the U.S. and Canada during COVID-19. See FAQs »

Check our COVID-19 Update Page to look for testing availability and review the health and safety measures required for testing.

We encourage you to schedule/purchase your exam online. Get started by logging in to your web account on the ICC - National Certification and UST/AST website. For any issues, contact us below or check our Frequently Asked Questions.

Global chat

Chat is the quickest way to reach a customer service agent.
Click on the Chat icon to get started.


If chat is “offline,” see below for telephone numbers and office hours.
Last updated 2020-05-01