What the Minnesota Hazmat Endorsement Test Covers
Minnesota's hazmat endorsement test is a written exam that measures your knowledge of how to safely transport hazardous materials by commercial truck. The test has 30 questions, and you need to answer at least 24 correctly to pass. All questions come from the Minnesota Commercial Driver's License (CDL) Manual, specifically the hazmat section.
The test covers nine main topics: hazmat classifications and labels, shipping papers and documentation, loading and unloading procedures, vehicle placarding, emergency response, hazmat vehicle equipment, driving rules for hazmat loads, hazmat incidents and accidents, and penalties for violations. You will not be asked about topics outside the manual, and you will not face questions about real-world scenarios that require judgment beyond what the manual teaches.
The test is computer-based at Minnesota Driver and Vehicle Services (DVS) exam stations. You take it after you pass the general CDL knowledge test but before you take the road test. The hazmat endorsement itself does not require a separate driving test — only the written exam.
Key Takeaways
- The Minnesota hazmat endorsement test has 30 questions, and you must answer at least 24 correctly to pass.
- All test content comes directly from the hazmat section of the Minnesota CDL Manual, which you can read free from the DVS website.
- You take the hazmat test after passing the general CDL knowledge test, and it costs a separate fee that varies depending on your DVS location.
- Practice tests that follow the same format and question types as the real exam help you identify weak areas before test day.
- Common mistakes include memorizing answers without understanding hazmat classifications, confusing placard colors, and rushing through questions about shipping documentation.
Where to Find the Official Minnesota CDL Manual
The Minnesota CDL Manual is the only source you need for accurate, state-specific information. You can read it free as a PDF from the Minnesota DVS website under the "Commercial Driver's License" section. The manual is updated when state or federal hazmat rules change, so read the most recent version before you study.
The hazmat section of the manual is typically 15 to 20 pages long. It includes diagrams of hazmat labels, placard examples, and tables showing which materials fall into each hazmat class. Print the hazmat section or read it on screen — either way, you should go through it at least twice before taking a practice test. Many test-takers miss questions because they skimmed the manual instead of reading it carefully.
The manual also lists the phone number and website for your local DVS exam station. Call ahead to confirm the test fee, which can range from $10 to $20 depending on location, and to ask whether you need to schedule your hazmat test in advance or whether you can take it the same day as your general CDL test.
How Practice Tests Work and What to Expect
A practice test mimics the real exam: 30 questions, multiple choice, computer-based format, and the same passing score of 24 correct answers. The best practice tests pull questions directly from the Minnesota CDL Manual hazmat section, so every question you see on a practice test could appear on the real exam.
When you take a practice test, treat it like the real thing. Sit at a desk, not on a couch. Do not use the manual while you are taking the test — use it afterward to review answers you got wrong. Time yourself: the real exam gives you about 45 minutes to an hour, so aim to finish your practice test in that window. This teaches you to read carefully without rushing.
After you finish, review every question you missed. Write down the topic (for example, "placard colors" or "shipping papers") and go back to the manual to reread that section. If you miss more than six questions on a practice test, take another practice test after you have studied the weak areas. Most test-takers need to take two or three practice tests before they are ready for the real exam.
Common Mistakes on the Hazmat Endorsement Test
The most frequent error is confusing hazmat class numbers with placard colors. For example, Class 3 (flammable liquids) uses a red placard, but Class 2 (gases) uses a green or red placard depending on the gas type. The manual shows each class with its placard, but many test-takers try to memorize the number without looking at the visual. When you study, always pair the class number with its placard color and label symbol.
A second common mistake is skipping the shipping papers section. Questions about what information must appear on a shipping paper, who signs it, and how long it must be kept are frequent on the real test. These details are in the manual but straightforward to overlook if you focus only on labels and placards. Spend at least one study session on shipping papers alone.
A third mistake is misreading questions about what you must do in an emergency. For example, a question might ask what you must do first if hazmat spills during transport — the answer is usually "move to a safe location and call for help," not "try to contain the spill." Read the word "first" or "must" carefully, because the manual often lists multiple correct actions in order of priority.
Study Timeline and Test Day Preparation
Plan to study for the hazmat endorsement over one to two weeks if you are already familiar with general CDL rules. If you are new to commercial driving, allow three to four weeks. Here is a realistic schedule: Week 1, read the hazmat section of the manual twice and take notes on topics that confuse you. Week 2, take a practice test without the manual, review your mistakes, and reread those sections. Week 3, take a second practice test and aim for at least 27 correct answers. If you score below 24, study for another week and take a third practice test.
On test day, bring your Minnesota driver's license or state ID, your CDL permit (if you have one), and any documents your local DVS station requires. Arrive 15 minutes early. The test is administered on a computer, and you will receive your score when ready after you finish. If you pass, the hazmat endorsement is added to your CDL. If you fail, you can retake the test — most stations allow you to schedule a retest within a few days.
Do not study the night before the test. Instead, review your notes for 30 minutes in the morning, eat a good breakfast, and get to the exam station early. Rushing or arriving stressed makes you more likely to misread questions.
Hazmat Endorsement Test Topics at a Glance
| Topic | What You Need to Know | Common Test Question Type |
|---|---|---|
| Hazmat Classes (1–9) | Each class number, its placard color, and examples of materials in that class | "Which placard is used for Class 3 materials?" |
| Labels and Placards | Difference between labels (on packages) and placards (on vehicles); when each is required | "What must appear on a hazmat placard?" |
| Shipping Papers | Required information, who must sign, how long to keep, where to store in the vehicle | "Where must shipping papers be kept while driving?" |
| Vehicle Equipment | Placards, hazard class labels, emergency equipment, vehicle condition requirements | "What equipment must a hazmat vehicle have?" |
| Loading and Unloading | Rules for securing loads, segregating incompatible materials, protecting packages | "Which materials cannot be loaded together?" |
| Driving Rules | Speed limits, parking restrictions, route planning, communication requirements | "Where can you park a hazmat vehicle?" |
| Emergencies and Incidents | What to do if hazmat spills, leaks, or ignites; who to notify; evacuation procedures | "What is the first step if hazmat spills during transport?" |
| Penalties and Violations | Fines and license suspension for hazmat violations | "What is the penalty for transporting hazmat without proper placards?" |
Frequently Asked Questions
Do I have to pass the general CDL test before I take the hazmat test?
Yes. You must pass the general CDL knowledge test first. Then you can take the hazmat endorsement test at the same visit or schedule it for another day. Some DVS stations allow you to take both tests back-to-back; others require you to schedule them separately. Call your local station to ask.
Can I use the manual during the hazmat test?
No. The test is closed-book. You must answer all 30 questions from memory. This is why practice tests are so important — they train you to recall information without looking it up.
What happens if I fail the hazmat endorsement test?
You can retake it. Most DVS stations let you schedule a retest within a few days or even the same week. You pay the test fee again. There is no limit to how many times you can retake it, but you must pass before the hazmat endorsement is added to your CDL.
How long is the hazmat endorsement valid?
The hazmat endorsement is valid for the same period as your CDL — typically five years in Minnesota. When you renew your CDL, you must renew the hazmat endorsement as well, which usually means retaking the hazmat test or passing a hazmat renewal test.
Are there any topics on the real test that are not in the practice tests?
No. The real test draws only from the Minnesota CDL Manual hazmat section. If a practice test includes a question that is not in the manual, that practice test is not accurate. Stick with practice tests that are based on the official Minnesota CDL Manual.