What You Need to Do to Add Tanker and Hazmat to Your CDL
A Tanker endorsement (T) and Hazmat endorsement (H) are separate additions to your CDL, each requiring its own written test and background check. You cannot combine them into a single test — you must pass both the Tanker exam and the Hazmat exam separately, though you can take them on the same day at your state's DMV. The Hazmat endorsement also requires a Transportation Security Administration (TSA) background check, which adds time and cost to the process.
Both endorsements are required if you drive a tanker truck carrying hazardous materials. If you only haul non-hazardous liquids in a tanker, you need only the Tanker endorsement. If you haul hazmat in any vehicle (not just tankers), you need only the Hazmat endorsement. Most tanker drivers need both.
Key Takeaways
- You must pass separate written tests for Tanker and Hazmat; each test covers different material and neither is included in your general CDL knowledge test.
- The Hazmat endorsement requires a TSA background check that can take 7 to 10 business days, so plan ahead before your test date.
- You must have a valid CDL (not just a permit) before you can add either endorsement.
- Fees vary by state but typically range from $10 to $25 per endorsement, plus the cost of the TSA background check (usually $85 to $97.50).
- You will need to bring your CDL, proof of citizenship or legal residency, and a valid ID to the DMV for your endorsement tests.
Tanker Endorsement Requirements and Test Content
The Tanker endorsement test covers the specific handling and safety rules for driving tanker trucks. The test is 20 questions, and you must score at least 80 percent to pass. You do not need any special training course — the knowledge comes from studying the Tanker section of your state's CDL manual, which is free and available online or at your DMV office.
The test covers topics such as: how liquid surge and slosh affect braking and turning, why tankers are more prone to rollover, proper tank filling and emptying procedures, weight distribution rules, and emergency procedures for spills or leaks. Many drivers underestimate this test because they assume tanker driving is straightforward; in reality, the physics of liquid movement inside a tank creates unique hazards that the test is designed to catch.
You do not need a commercial driving school or special endorsement course to take the Tanker test. You can study on your own using your state's CDL manual. However, some drivers find it helpful to watch videos or take online practice tests to understand the concepts, especially the physics of load surge.
Hazmat Endorsement Requirements and TSA Background Check
The Hazmat endorsement test is 30 questions, and you must score at least 80 percent. Like the Tanker test, it is based on material in your state's CDL manual and does not require a formal course. The test covers hazardous materials classifications, shipping papers, placarding rules, loading and unloading procedures, and emergency response.
Before you can take the Hazmat test, you must complete a TSA background check. This is not optional and is not done at the DMV — you initiate it through the TSA's Hazmat Threat Assessment Program (HTAP). You will need to provide your full legal name, date of birth, Social Security number, and citizenship or immigration status. The TSA will check your criminal history, immigration records, and other databases. The background check typically takes 7 to 10 business days, though it can take longer if the TSA needs to investigate further.
You cannot take the Hazmat test until the TSA has cleared you. Once you pass the background check, the DMV will allow you to sit for the test. If the TSA denies you, you have the right to appeal, but this process is separate from the DMV and can take weeks.
Step-by-Step Process to Add Both Endorsements
| Step | Action | Timeline |
|---|---|---|
| 1 | Verify you have a valid CDL (not a permit). Check your license to confirm it is not expired. | Same day |
| 2 | Obtain your state's CDL manual. read it from your state DMV website or pick up a printed copy at the DMV office. | Same day |
| 3 | Study the Tanker section and the Hazmat section of the manual. Use practice tests if available on your state's DMV website. | 3 to 7 days (varies by person) |
| 4 | Initiate the TSA Hazmat background check through HTAP. You will receive a confirmation number and a fee invoice (usually $85 to $97.50). | Same day; processing takes 7 to 10 business days |
| 5 | Pay the TSA background check fee. You can pay online through the HTAP portal. | Same day |
| 6 | Wait for TSA clearance. You will receive an email or letter confirming approval or denial. | 7 to 10 business days |
| 7 | Schedule an appointment at your state DMV to take the Tanker and Hazmat tests. Bring your CDL, proof of citizenship or legal residency, valid ID, and TSA clearance confirmation. | Same day (or next available appointment) |
| 8 | Take the Tanker test (20 questions, 80% pass score required). If you pass, proceed to the Hazmat test. | Same day |
| 9 | Take the Hazmat test (30 questions, 80% pass score required). | Same day |
| 10 | Pay endorsement fees (typically $10 to $25 per endorsement, depending on your state). The DMV will issue your updated CDL with both endorsements. | Same day or within 1 to 2 weeks by mail |
Documents You Must Bring to the DMV
When you go to take your Tanker and Hazmat tests, bring the following documents:
- Your current CDL (not a permit or learner's permit).
- Proof of citizenship or legal residency (passport, birth certificate, green card, or state ID).
- A valid photo ID (driver's license, passport, or military ID).
- TSA Hazmat background check clearance confirmation (email or letter from TSA).
- Payment for endorsement fees (cash, check, or debit/credit card, depending on your state's DMV).
Some states also require proof of your Social Security number. Check your state's DMV website before you go to confirm what documents are needed in your state.
Common Mistakes That Delay or Prevent Endorsement
Many drivers attempt the Hazmat test before the TSA background check is complete. The DMV will not let you sit for the test without TSA clearance, so you will waste a trip and a test fee. Start the TSA background check as soon as you decide you need the Hazmat endorsement, not the day before your planned test date.
Another common mistake is failing to bring proof of citizenship or legal residency. The DMV cannot issue an endorsement without it, and you will have to reschedule. Verify your state's specific document requirements on its DMV website before you make an appointment.
Some drivers study only the general CDL manual and skip the Tanker and Hazmat sections, assuming the knowledge overlaps with their general CDL test. It does not. The Tanker and Hazmat tests are separate and cover material not on the general CDL exam. Budget at least 3 to 5 days of focused study for each endorsement.
Fees and Timeline Summary
The total cost to add both endorsements varies by state but typically breaks down as follows:
- TSA Hazmat background check: $85 to $97.50 (federal fee, same in all states).
- Tanker endorsement fee: $10 to $25 (varies by state).
- Hazmat endorsement fee: $10 to $25 (varies by state).
Total cost is typically $105 to $147.50. Some states charge a single fee for both endorsements rather than separate fees; check your state DMV website for exact pricing.
The total timeline from start to finish is typically 2 to 3 weeks if you study efficiently and the TSA background check clears without delay. The longest wait is the TSA background check (7 to 10 business days). If the TSA needs additional investigation, the timeline can extend to 3 to 4 weeks.
Frequently Asked Questions
Can I take the Tanker and Hazmat tests on the same day?
Yes. Once you have TSA clearance for Hazmat, you can take both tests in a single DMV visit. Most DMVs allow you to take them back-to-back on the same appointment. Confirm with your state DMV when you schedule.
What happens if I fail the Tanker or Hazmat test?
You can retake the test, usually within a few days. Most states allow you to retake a failed endorsement test when ready or within a short window without reapplying or paying the fee again. Check your state's specific retake policy when you fail.
Do I need a commercial driving school to study for these tests?
No. Both tests are based on material in your state's free CDL manual. Many drivers study on their own and pass. Some use online practice tests or videos to supplement the manual, but a formal school is not required.
Can I get the Hazmat endorsement without the Tanker endorsement?
Yes. If you haul hazmat in a regular truck (not a tanker), you need only the Hazmat endorsement. If you haul non-hazardous liquids in a tanker, you need only the Tanker endorsement. Both are separate and optional depending on your job.
What if the TSA denies my background check?
You have the right to appeal the TSA's decision. The appeal process is handled by the TSA, not the DMV, and can take several weeks. You cannot take the Hazmat test until the denial is overturned. Contact the TSA directly for appeal instructions.