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  • Updated for May 2025
  • Based on 2025 IA commercial driver's license manual

Free Iowa CDL HazMat Endorsement Practice Test 2025

If you’ve seen the classic Broadway musical, “The Music Man,” or Rodgers and Hammerstein’s “State Fair,” both set in Iowa, or if you’ve transported cargo from the state, you are already familiar with the state’s renowned corn, soybeans, and livestock. It’s also well known for its food processing facilities, machine manufacturing, and renewable energy, which may be why you’re interested in adding the Hazardous Materials (Hazmat) endorsement to your Commercial Driver’s License (CDL) for all the added benefits that come with it. This is a fabulous way to expand your job opportunities and increase your earning potential! In Iowa, you’ll experience the steep bluffs and winding roads of the Mississippi River Valley, the floodplains of the Missouri and Des Moines Rivers, the extensive farmlands and their rural roadways, not to mention Iowa’s winter snow and ice storms, spring flooding, and summer thunderstorms. Transporting cargo in Iowa comes with challenges, but the rewards offered in this career and the additional opportunities available with the Hazmat endorsement make it worth the effort.

The U.S. government classifies certain materials hazardous, requiring drivers to obtain a Hazmat endorsement for these specialized, often higher-paying, jobs. In the Hawkeye State, hazardous materials like anhydrous ammonia, pesticides and herbicides, petroleum products, ethanol and biodiesel, and industrial chemicals are transported. Major organizations in Iowa, such as CF Industries in Sergeant Bluff and Ag Partners in Albert City (agriculture), POET Bioprocessing (with multiple locations), and Casey’s General Stores, headquartered in Ankeny, rely on Hazmat drivers.

The process starts with a mandatory fingerprinting and background check conducted by the Transportation Security Administration (TSA). Do this right away as the results can take weeks, which can be used to study and practice for the second step: the DOT knowledge test (Iowa CDL Handbook 2025). This test has 30 questions and covers federal regulations, substance handling, packaging, quantity limits, and transport configurations for hazardous materials. You must pass it with a score of at least 80%.

We have simplified this process for you with our Iowa DOT Hazmat Endorsement practice tests, which avoid unnecessary information and resemble what you will face on the official DOT test. Once you receive your TSA results and feel prepared, you’ll visit the DOT with the necessary documents, pay the fees, and pass the test.

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IA commercial driver's license
  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
  • Triple-checked for accuracy

What you need to know

4.3 out of 5 • 30 votes
7 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

What to expect on the actual IA DOT exam

30

questions

24

correct answers to pass

80%

passing score

List of questions (classic view)

  1. How often should you check the tires on a placarded trailer that has dual tires?
  2. What action should you take if you discover your hazardous materials shipment leaking at a rest stop but there is no phone available?
  3. Your engine runs a pump when you are delivering compressed gas. After finishing the delivery, when should you turn off the engine?
  4. If you are already carrying 100 pounds of silver cyanide, what precautions must you take if you are given papers at a dock to carry 100 cartons of battery acid?
  5. You must NEVER smoke or perform any activity involving fire within 25 feet of
  6. Do you need to stop before a railroad crossing if you are hauling 100 pounds of Division 4.3 materials?
  7. When shippers package the material, they are trying to
  8. What is the purpose of a driver placarding his or her vehicle?
  9. Which of the following is NOT an acceptable type of marking for hazardous materials?
  10. Cargo tanks are
  11. If you are carrying Division 1.2 or 1.3 materials, how far away must you park from the traveled portion of the roadway?
  12. How far away are you allowed to park from a bridge, tunnel, or building if you are carrying Division 1.2 or 1.3 materials?
  13. Which of the following hazard classes uses a transport index to determine how much of it can be loaded on a single vehicle for transport?
  14. Which of the following materials is an acceptable floor liner for moving Division 1.1 or 1.2 materials?
  15. What are the two main places where the hazardous material identification number appears?
  16. What are the major differences between cargo tanks and portable tanks?
  17. Which of the following are necessary qualifications for non-bulk packaging?
  18. A safe haven is
  19. A placarded vehicle must carry a fire extinguisher with a minimum rating of
  20. To determine if you need to use placards, which of the following is NOT something you need to know?
  21. What is a technical name?
  22. In what location must you keep your shipping papers that describe any hazardous materials?
  23. Besides the shipping papers and the packages, the other two places where the hazardous material identification number must appear are
  24. Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater/air conditioner unit)?
  25. The Emergency Response Guidebook (ERG)
  26. The hazardous material identification numbers must be displayed on portable tanks, cargo tanks, and other bulk packaging. The regulations require black _______ numbers.
  27. At a rest stop, you discover that your hazardous materials shipment is leaking but there is no phone available. What do you do?
  28. You may not park a vehicle carrying explosives within ____ feet of an open fire.
  29. If hazardous material is spilling from your vehicle, do not move your vehicle
  30. A truck carrying explosives has collided with another vehicle. You should not pull them apart until
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