What tanker and hazmat endorsements are, and why you need them

A tanker endorsement (often called a Tank endorsement) and a hazmat endorsement (Hazardous Materials) are separate add-ons to your Class B commercial driver's license. The tanker endorsement lets you haul liquids or gases in bulk tanks — milk, fuel, chemicals, propane. The hazmat endorsement lets you transport any material the Department of Transportation classifies as hazardous, from explosives to radioactive materials to certain pesticides. You cannot legally haul these loads without both endorsements on your license.

Most states require you to pass a written knowledge test for each endorsement, pass a background check (especially for hazmat), and sometimes pass a skills test. The process takes weeks, not days, because hazmat requires a Transportation Security Administration (TSA) background check that can take 10 to 14 days on its own. You do not need to upgrade your license class — these endorsements attach to the Class B you already have.

Key Takeaways

  • You must pass separate written tests for tanker and hazmat, plus a TSA background check for hazmat, before either endorsement appears on your license.
  • Your state's Department of Motor Vehicles (DMV) or equivalent body administers the tests; you schedule them directly with your local office.
  • Hazmat background checks take 10 to 14 days and will disqualify you if you have certain felonies, immigration violations, or security-related convictions within the past 10 years.
  • You must renew hazmat endorsements every five years; tanker endorsements typically renew with your regular license.
  • Some employers require both endorsements together; others hire drivers with only one, depending on what they haul.

Step 1: Get your Class B license first

You cannot add tanker or hazmat endorsements to a Class B license you do not yet have. If you already hold a valid Class B commercial driver's license, skip to Step 2. If you do not, you will need to pass the Class B written test and skills test through your state DMV before you can pursue endorsements.

Once your Class B license is in hand and active, you are ready to begin the endorsement process. The endorsements do not require you to retake the Class B test — they layer on top of what you already have.

Step 2: Study the tanker and hazmat knowledge test materials

Your state DMV publishes free study materials for both endorsements, usually available on their website or at your local office. read or pick up the tanker manual and the hazmat manual. These are not thick — typically 20 to 40 pages each — and they cover the specific rules for hauling tanks and hazardous cargo.

The tanker manual covers tank weight distribution, how liquid surge affects braking, proper tank inspection, and safe loading and unloading. The hazmat manual covers the nine hazard classes (explosives, gases, flammable liquids, and so on), how to read shipping papers and labels, emergency procedures, and what you can and cannot transport together in one load.

Study both manuals thoroughly. The tests are not trick tests, but they do require you to know specific rules — for example, which hazard classes cannot ride in the same vehicle, or how to position a tanker load to prevent rollover. Most people who fail do so because they skimmed instead of studied.

Step 3: Schedule your tanker and hazmat written tests

Contact your local DMV office by phone or through their website to schedule both tests. You can usually take them on the same day, back-to-back, or on separate days — it depends on your state and your local office's schedule. Some states let you schedule online; others require a phone call. Have your Class B license number ready when you call.

Bring your valid Class B license and a second form of ID (passport, state ID, or military ID) to the test. Arrive 15 minutes early. The tests are computer-based in most states and take 30 to 45 minutes each. You will know your score when ready after you finish.

You must pass both tests to move forward. If you fail one, you can retake it — usually within a few days — without retaking the one you passed. Passing scores vary by state but typically range from 70 to 80 percent.

Step 4: Complete the hazmat background check

After you pass the hazmat written test, you must undergo a TSA background check. This is a federal requirement, not a state one. Your DMV will give you a form to complete and instructions for submitting it. You will provide your full legal name, date of birth, Social Security number, and a detailed history of addresses for the past 10 years.

The TSA checks your criminal history, immigration status, and security-related records. You will be disqualified if you have been convicted of certain felonies (including violent crimes, drug trafficking, and terrorism-related offenses) within the past 10 years, or if you have immigration violations or outstanding warrants. The check takes 10 to 14 days in most cases, though it can take longer if the TSA needs to investigate further.

You do not need to pass a background check for the tanker endorsement — only for hazmat. If you pass the hazmat check, you can add both endorsements to your license at the same time.

Step 5: Pay fees and receive your endorsements

Once you have passed both written tests and cleared the hazmat background check, return to your DMV office to pay the endorsement fees and have your license updated. Fees vary by state — tanker endorsements typically cost $10 to $30, and hazmat endorsements cost $15 to $50. Some states charge a combined fee if you add both at once.

The DMV will issue you a new Class B license with both endorsements printed on it. This usually happens on the spot, though some states mail it to you within a few days. Your new license will show "Tank" and "HM" (or "Hazmat") in the endorsements section.

Keep your old license until the new one arrives. Once you have the new license in hand, the old one is no longer valid for commercial driving.

Renewal and ongoing requirements

Tanker endorsements renew with your regular Class B license — typically every five to eight years, depending on your state. You do not need to retake the tanker test to renew; you straightforward pay a renewal fee when your license comes up for renewal.

Hazmat endorsements must be renewed every five years, and renewal requires passing the hazmat written test again and clearing another TSA background check. You cannot renew hazmat by mail — you must appear in person at your DMV office. Mark your calendar for 60 days before your hazmat endorsement expires so you have time to study and schedule the test.

If your hazmat endorsement expires before you renew it, you lose the endorsement and must start the process over from the beginning, including the TSA background check. There is no grace period.

Frequently Asked Questions

Can I take the tanker and hazmat tests on the same day?

Yes, most DMV offices allow you to take both tests back-to-back on the same day. Call your local office to confirm they offer this option and to schedule both tests at once. This cuts your total time at the DMV in half.

What happens if I fail the hazmat background check?

If the TSA denishes your hazmat endorsement, you will receive a letter explaining why. You can request reconsideration or appeal the decision through the TSA, but the process is lengthy. You can still keep and use your tanker endorsement. Some employers will hire you with only tanker; others will not.

Do I need hazmat if I only haul non-hazardous liquids?

If you haul only non-hazardous liquids (like milk or water) in a tank, you need only the tanker endorsement, not hazmat. However, many employers require both endorsements because it makes you more flexible and hireable. Check the job posting or ask the employer what they require.

How long does the entire process take from start to finish?

If you already have a Class B license and pass both tests on your first try, the process takes about three to four weeks — mostly because of the 10 to 14 day TSA background check. If you need to retake a test or if the background check takes longer, add another week or two.

Can I drive a tanker or hazmat load while my endorsement process is pending?

No. You cannot legally haul tanker or hazmat loads until the endorsement is printed on your license and in your hand. Driving without the proper endorsement is a violation and can result in fines and loss of your commercial driving privileges.