🚛 CDL N Endorsement (FMCSA)
Pass the CDL N Endorsement (FMCSA) Exam.
We're building CDL Tanker Endorsement Exam Prep — 1,000+ practice questions for the CDL Tanker (N) endorsement knowledge test (FMCSA), plus a built-in Liquid Surge & Stability Reference. Join the waitlist and be first to know when it launches.
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CDL Tanker Endorsement Exam Prep
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Download your free CDL N Endorsement (FMCSA) study guide PDF — key formulas, reference tables, and exam topics.
Download Free Study Guide →Frequently Asked Questions
What is the CDL Tanker endorsement?
The CDL Tanker (N) endorsement is required to operate any tank vehicle — a vehicle designed to transport any liquid or gaseous material in a tank with a capacity of 119 gallons or more permanently attached to the vehicle. This includes fuel tankers, water trucks, and liquid chemical carriers. The endorsement requires passing a knowledge test.
How many questions is the CDL Tanker endorsement test?
The CDL Tanker endorsement knowledge test is typically 20–30 questions depending on your state. The hardest topics are liquid surge and stability (how moving liquid affects vehicle handling), outage requirements, and baffled vs. non-baffled tank behavior. A passing score of 80% is required in most states.
Do I need a Tanker endorsement to haul water?
Yes, if the water tank is permanently attached to your vehicle and has a capacity of 119 gallons or more, you need the CDL Tanker (N) endorsement. If the tank is portable (not permanently mounted), the endorsement may not be required. Check with your state DMV for the specific definition used in your jurisdiction.
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