You take your tanker endorsement test at your state's Department of Motor Vehicles (DMV) or equivalent licensing agency

The tanker endorsement test is administered only by your state's DMV — you cannot take it at a third-party testing location, online, or through a private school. You must go in person to a DMV office that offers CDL testing. Not every DMV location administers CDL tests, so you'll need to find the specific office in your state that handles them.

Before you show up, you'll need to pass the tanker knowledge test (the written exam covering tank vehicle safety and operation) and meet all other CDL requirements for your state. The test itself is short — usually 20 questions — and you must score at least 80 percent to pass.

Key Takeaways

  • Your state's DMV is the only place that administers the tanker endorsement test; call ahead to confirm your local office offers CDL testing.
  • You must pass the tanker knowledge test (written exam) before you can take the skills test, which includes a pre-trip inspection and driving portion.
  • Bring your current CDL, proof of residency, and any documents your state requires for endorsement testing.
  • Testing fees vary by state, ranging from around $10 to $50 for the knowledge test and $50 to $150 for the skills test.
  • Schedule your test appointment in advance; many DMV offices book CDL tests weeks ahead, especially in busy seasons.

Finding your state's DMV CDL testing locations

Start by visiting your state's DMV website and searching for "CDL testing locations" or "commercial driver's license testing." Most states list every office that administers CDL exams, along with their hours and whether they require appointments. Some states use a separate commercial driver's license testing facility rather than a standard DMV office.

If the website doesn't clearly list locations, call your state's DMV main line and ask which office nearest you administers tanker endorsement tests. Be specific: ask whether they handle both the knowledge test and the skills test, because some locations only offer one or the other. Write down the office address, phone number, and whether you need an appointment.

A few states contract with third-party testing companies to administer the knowledge test portion, though the skills test always happens at an official DMV location. Check your state's rules before you assume you can test anywhere.

What you need to bring to the testing location

Bring your current commercial driver's license, your state ID or passport, and proof of residency (a utility bill or lease agreement dated within the last 60 days). You'll also need to bring any medical certification or other documents your state requires for CDL holders.

Some states require you to submit a tanker endorsement process form before you test. Check your state's DMV website or call ahead to ask whether you need to fill out paperwork in advance or bring it with you on test day. Arriving without required documents will mean a wasted trip.

Bring cash or a debit card for the testing fee. Most DMV offices accept both, but a few still take cash only, so confirm when you call to schedule your appointment.

The knowledge test and skills test at the DMV

The tanker knowledge test is a written exam you take on a computer or paper at the DMV office. You'll answer 20 questions about tank vehicle safety, including proper braking, weight distribution, emergency procedures, and hazmat rules specific to tanker operations. You have a set time limit (usually 60 minutes) and must score at least 80 percent to pass.

If you pass the knowledge test, you can schedule your skills test, which includes a pre-trip inspection (where you walk around the vehicle and point out safety features), a basic control test (backing, turning, and parking), and a road test (driving on public roads). The skills test is administered by a DMV examiner and usually takes 30 to 45 minutes total.

You cannot take the skills test on the same day as the knowledge test in most states. Plan for at least a few days between passing the written exam and your road test appointment.

Scheduling your appointment and preparing for test day

Call the DMV testing location as soon as you know you're ready to test. CDL appointments fill up quickly, especially during peak hiring seasons in the transportation industry. Some states allow online scheduling; others require a phone call. Ask about wait times — in busy areas, you might wait three to six weeks for an opening.

Confirm the exact date, time, and location of your appointment. Ask what time you should arrive (usually 15 minutes early) and whether you need to bring your own vehicle for the skills test or whether the DMV provides one. Some states require you to bring a tanker truck that meets specific requirements; others have test vehicles on site.

Study the tanker knowledge test questions using your state's CDL manual or a tanker endorsement study guide. The DMV manual is free and covers everything on the test. Spend extra time on braking systems, weight transfer, and emergency procedures — these topics appear frequently on tanker tests.

What happens if you fail the test

If you fail the knowledge test, you can retake it after a waiting period. Most states allow you to retake the test the same day or the next business day, though a few require you to wait a week. Each retake has its own fee.

If you fail the skills test, you'll need to schedule another appointment. There's usually a waiting period of a few days to a week before you can test again. You don't need to retake the knowledge test — only the skills portion.

Keep track of how many times you've taken the test. Some states limit the number of retakes within a certain period, though this is uncommon for endorsement tests.

Testing fees and what they cover

Tanker endorsement testing fees vary by state. The knowledge test typically costs $10 to $50, and the skills test costs $50 to $150. A few states charge a combined fee for both tests; others charge separately. Some states include the endorsement fee in the test cost; others charge an additional fee to add the endorsement to your license once you pass.

Ask about the total cost when you call to schedule your appointment. Some DMV offices accept payment by card, cash, or check; others have restrictions. Confirm payment methods ahead of time so you're not surprised on test day.

If you're testing through a third-party knowledge testing center (in states that allow it), the fee may be different from the DMV's fee. The skills test, however, is always administered by the DMV and uses the DMV's fee schedule.

Frequently Asked Questions

Can I take the tanker endorsement test at a truck driving school instead of the DMV?

No. Truck driving schools can teach you the material and may administer practice tests, but only your state's DMV can administer the official tanker endorsement test. Some schools have partnerships with DMV testing locations, but the test itself must be taken at an official DMV office or an approved third-party testing site contracted by your state.

Do I need to bring my own tanker truck for the skills test?

It depends on your state. Some states require you to bring a tanker truck that meets specific specifications; others provide a test vehicle. Call the DMV testing location and ask what vehicle requirements explore. If you must bring your own, confirm the truck is properly registered, insured, and passes a pre-inspection.

How long does it take to get results after I pass the test?

You usually receive your knowledge test results when ready after taking the exam. For the skills test, results are typically available the same day or within a few business days. Your endorsement is added to your license once you pass both tests and pay any final fees. You may receive a temporary permit on test day and your official license in the mail.

What if my state doesn't have a DMV office near me?

Contact your state's DMV and ask about testing locations in neighboring counties or regions. Some states allow you to test in a different county if no location is available near you. A few states offer mobile testing units that travel to rural areas on a schedule — ask whether your state runs a program like this.

Can I retake the knowledge test when ready if I fail?

Most states allow you to retake the knowledge test the same day or the next business day, but a few require a waiting period of several days or a week. Check your state's rules when you schedule your first test so you know what to expect if you don't pass on your first attempt.