How to Get Your Hazmat Endorsement in Missouri

What You Need to Do to Get a Hazmat Endorsement in Missouri

A hazmat endorsement (also called an HE or H endorsement) lets you haul hazardous materials on a commercial truck. In Missouri, you add it to your CDL by passing a written test, passing a background check, and paying a fee. The whole process takes a few weeks if you move through it steadily, though the background check can take longer depending on what comes up.

You do not need a hazmat endorsement to drive a commercial truck in Missouri — only if your job involves transporting hazardous cargo. If your employer requires it or you want to expand what you can haul, you start by studying the hazmat section of the CDL manual, take the written test at a Missouri license office, and then wait for the Transportation Security Administration (TSA) to clear your background.

Key Takeaways

You must pass the hazmat written test at a Missouri Department of Revenue license office before the TSA background check begins.
The TSA conducts a fingerprint-based background check that can take two to four weeks or longer, and you cannot drive hazmat cargo until it clears.
You need a valid CDL, a passing hazmat test score, and payment of the endorsement fee to receive your hazmat-endorsed license.
Missouri does not require a separate road test for the hazmat endorsement — only the written test and background clearance.

Study the Hazmat Section of the CDL Manual

Before you test, you need to study the hazmat material in the Missouri CDL Manual. This section covers what counts as hazardous material, how to identify it, how to load and transport it safely, and what to do in an emergency. The manual is free and available on the Missouri Department of Revenue website.

The hazmat test focuses on practical safety knowledge, not trivia. You will see questions about placards (the diamond-shaped warning labels on trucks), shipping papers, vehicle inspection, and emergency procedures. Many people study for one to two weeks before testing, depending on how much hazmat knowledge they already have from their job.

Take the Hazmat Written Test at a Missouri License Office

You take the hazmat test at any Missouri Department of Revenue license office that administers CDL tests. Call ahead or check the office's website to confirm they offer hazmat testing on the day you plan to go. You will need to bring your valid CDL, a form of identification, and payment for the test fee (Missouri charges a fee for each endorsement test).

The test has 30 questions, and you must answer at least 24 correctly to pass. You get one attempt per visit, so if you fail, you can retake it on another day. Most people finish the test in 30 to 45 minutes. Once you pass, the license office records your passing score in the Missouri system.

Submit to the TSA Background Check

After you pass the written test, the Missouri Department of Revenue submits your information to the Transportation Security Administration (TSA) for a background check. This is a fingerprint-based check that looks at criminal history, immigration status, and other security factors. You do not explore for this separately — the state handles it once your test passes.

The TSA background check typically takes two to four weeks, but can take longer if there are questions about your record or if the TSA is processing a high volume of requests. During this time, you cannot legally drive hazmat cargo. Your employer should know this timeline so they do not expect you to haul hazmat loads before the check clears.

If the TSA denies your background check, you will receive a letter explaining why. Some denials can be appealed, but the process is lengthy. If you are approved, the TSA notifies Missouri, and the state issues your hazmat-endorsed license.

Pay the Endorsement Fee and Receive Your License

Once the TSA clears you, you return to a Missouri license office to pay the hazmat endorsement fee and receive your updated CDL. The fee covers the endorsement itself and is separate from any test fees you already paid. Bring your valid CDL and a form of identification.

The license office will issue you a new CDL card with the hazmat endorsement printed on it. This usually happens the same day or within a few business days. Your new license will show the H or HE endorsement code, which tells law enforcement and shippers that you are authorized to haul hazardous materials.

What Happens If Your Background Check Is Denied

If the TSA denies your background check, you have the right to request a information of Ineligibility (DI) appeal. This is a formal review process where you can present information or documents that address the reason for the denial. The appeal must be filed within 60 days of the denial letter.

The appeal process is handled by the TSA and can take several months. You will need to gather documents, write a detailed response, and possibly attend a hearing. Many people work with a lawyer for this process because the rules are technical. If the appeal is denied, you cannot hold a hazmat endorsement in Missouri, though you can still drive a regular CDL.

Renewing Your Hazmat Endorsement

Your hazmat endorsement expires when your CDL expires. In Missouri, a CDL is valid for four years. When you renew your CDL, you must also renew your hazmat endorsement by passing the hazmat written test again and undergoing another TSA background check.

You can renew your hazmat endorsement up to 90 days before your current CDL expires. Start the process early so there is no gap where you cannot haul hazmat cargo. The renewal process is the same as the initial process: written test, TSA background check, fee payment, and new license issuance.

Frequently Asked Questions

Can I drive hazmat cargo while my TSA background check is pending?

No. You can only haul hazmat cargo after the TSA background check is complete and approved. Even though you passed the written test, the background clearance is required before you are legally authorized. Your employer should schedule hazmat loads only after you have your endorsed license in hand.

What disqualifies you from getting a hazmat endorsement in Missouri?

The TSA denies hazmat endorsements for serious criminal convictions, immigration violations, certain drug offenses, and other security concerns. The TSA does not publish a complete list of disqualifying factors, but felonies and crimes involving explosives, weapons, or fraud are common reasons for denial. If you have a criminal record, contact the TSA or a lawyer before testing.

Do I need a hazmat endorsement to haul all commercial cargo?

No. You only need a hazmat endorsement if you are hauling materials classified as hazardous by the Department of Transportation — things like fuel, chemicals, explosives, and certain food additives. Regular freight, construction materials, and most consumer goods do not require a hazmat endorsement. Your employer will tell you if the job requires it.

How much does the hazmat endorsement cost in Missouri?

Missouri charges a fee for the hazmat test and a separate fee for the endorsement itself. The exact amounts vary and can change, so call your local Missouri Department of Revenue license office or check their website for current pricing before you go in to test.

Can I take the hazmat test online in Missouri?

No. Missouri requires you to take the hazmat written test in person at a Department of Revenue license office. You cannot test online or at a third-party testing center. You must go to an office that administers CDL tests and take the test there under supervision.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.