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How to add tanker endorsement to CDL in California?

Tina Tran
Tina Tran
Created at September 3, 2025

How to add tanker endorsement to CDL in California? There are 6 steps to add a tanker endorsement to your CDL in California. The process is quite simple, but how exactly should you do it and what should you pay attention to along the way? Don’t worry, here’s Easy Prep’s detailed guide to help you easily add a tanker endorsement to your CDL in California.

How to add tanker endorsement to CDL in California?

How to add tanker endorsement to CDL in California

How to add tanker endorsement to CDL in California

There are 6 essential steps to adding a tanker endorsement to your CDL in California.  A tanker endorsement is mandatory for drivers holding a Class A, B, or C Commercial Driver’s License (CDL) when operating a vehicle that transports liquids or liquefied gases in tanks with an individual capacity of 119 gallons or more, or a total combined capacity of 1,000 gallons or more. Below is a clear, step-by-step breakdown of exactly what you need to do to obtain your tanker endorsement in California.

Step 1: Hold a valid CDL

Hold a valid CDL

Hold a valid CDL

The first requirement for adding a tanker endorsement to your CDL in California is to already possess a valid Commercial Driver’s License (CDL). Without an active CDL in Class A, B, or C, you won’t be eligible to apply for the tanker endorsement.

Step 2: Study tanker vehicle knowledge

The next step is to prepare for the written knowledge test on tanker vehicles. This involves gaining a solid understanding of both the practical and theoretical aspects of operating a tanker. Key topics include:

  • Bulk tank operations: how tanker systems work and the correct procedures for loading and unloading.
  • Inspecting tank vehicles: pre-trip and post-trip inspections to ensure safety and compliance.
  • Driving tank vehicles: handling the unique dynamics of tankers, especially during turns and stops.
  • Handling liquids and gases: safe methods for transporting various types of cargo.
  • Emergency procedures: steps to take in case of leaks, spills, or accidents.
  • Liquid surge: understanding how liquid movement inside the tank affects vehicle stability.
  • Safe driving techniques: speed management, braking, and cornering for tankers.
  • Weight distribution: balancing loads to maintain vehicle control.
  • California-specific regulations: laws and safety requirements for transporting liquids or liquefied gases in the state.

Thorough preparation at this stage greatly increases your chances of passing the tanker endorsement knowledge test on your first attempt. Use online resources such as our California Tanker CDL practice tests, study guides to strengthen your understanding and improve your test performance.

Step 3: Schedule your written test at the DMV

Schedule your written test at the DMV

Schedule your written test at the DMV

Once you’ve studied and feel confident in your knowledge of tanker vehicle operation, schedule your tanker endorsement written test at your local California Department of Motor Vehicles (DMV) office. You can also schedule California DMV appointments by calling the DMV’s automated call service at (800) 777-0133, which is available 24 hours a day, 7 days a week. Booking in advance ensures you get a convenient date and time while avoiding long wait periods.

Step 4: Take the test

The tanker endorsement knowledge test typically consists of 20-30 multiple-choice questions and takes about 30-60 minutes to complete. On the day of your exam, arrive early and bring all required documents. The test will evaluate your understanding of tanker vehicle safety, proper handling techniques, liquid surge, emergency procedures, and legal requirements specific to California. Passing this exam is a critical step in earning your tanker endorsement and moving forward in the licensing process.

Step 5: Pay the testing fee

In California, the cost to add a tanker endorsement to your CDL is $58. This fee is paid directly to the DMV when completing your application after passing the test. Be prepared to make the payment by cash, card, or another accepted method at your DMV location.

Step 6: Update your CDL with the tanker endorsement

Update your CDL with the tanker endorsement

Update your CDL with the tanker endorsement

After you’ve passed the test and paid the required fee, the DMV will officially update your Commercial Driver’s License to include the tanker endorsement. This update confirms that you are legally qualified to operate tanker vehicles under California regulations. You’ll receive either a temporary paper license or your new physical CDL by mail, showing the added endorsement.

Conclusion

So, how to add tanker endorsement to CDL in California? By now, you should have a clear understanding of this straightforward process through Easy Prep’s guide. It’s simpler than it might seem. Just follow the six steps, prepare thoroughly, and pay attention to the details. Once you pass the test and update your license, you’ll unlock more career opportunities in the trucking industry. With the right preparation, earning your tanker endorsement can be a smooth and quick process.