Do I need to retake the Hazmat written test to renew?

Yes — federal rules require passing the Hazmat knowledge test again each time you renew the endorsement, in addition to renewing the TSA threat assessment.

How is Hazmat different from TWIC?

TWIC is a credential for accessing secure port and maritime facilities; the Hazmat endorsement is on your CDL and authorizes hauling hazardous materials. A valid TWIC can reduce the Hazmat threat-assessment fee in some states.

The Hazmat Endorsement & TSA Threat Assessment

What the H endorsement adds, the federal background check it requires, and what it costs to keep it.

Key Facts

The Hazmat (H) endorsement lets you haul placardable quantities of hazardous materials.
It requires a TSA Security Threat Assessment (STA) — a criminal, immigration, and terrorist-watchlist check — not just a written test.
As of January 1, 2025, TSA's HME threat-assessment fee is $85.25 (a reduced $41 rate applies for valid TWIC holders in comparable states).
The STA is valid for five years, though your state sets when the endorsement expires on your CDL.

What it lets you do

The H endorsement authorizes you to transport hazardous materials in quantities that require placards. Hazmat freight often pays more, but it comes with extra rules on handling, documentation, and security.

The TSA background check

Unlike most endorsements, Hazmat requires a federal Security Threat Assessment through TSA's Hazardous Materials Endorsement Threat Assessment Program. TSA runs criminal history, immigration, and terrorist-watchlist checks. You apply, get fingerprinted, and pay the fee before your state will add the endorsement.

Cost and renewal

As of January 1, 2025, the standard TSA HME fee is $85.25; drivers who already hold a valid TWIC card in a comparable state may qualify for a reduced $41 rate. The threat assessment stays valid for five years, but the actual expiration on your license follows your state's CDL rules — so track it alongside your other documents. Fees and rules change, so confirm the current amount with TSA before you enroll.

Frequently Asked Questions

Do I need to retake the Hazmat written test to renew?: Yes — federal rules require passing the Hazmat knowledge test again each time you renew the endorsement, in addition to renewing the TSA threat assessment.
How is Hazmat different from TWIC?: TWIC is a credential for accessing secure port and maritime facilities; the Hazmat endorsement is on your CDL and authorizes hauling hazardous materials. A valid TWIC can reduce the Hazmat threat-assessment fee in some states.