The Mississippi hazmat endorsement test checks whether you understand how to transport dangerous materials safely

The hazmat endorsement is an add-on to your commercial driver's license (CDL) in Mississippi. It shows that you know the rules for carrying hazardous materials — things like explosives, flammable liquids, gases, poisons, and radioactive materials. You take a written test at your local Mississippi Department of Public Safety driver's license office.

The test itself is not separate from your CDL process. If you already have a CDL, you can test for the hazmat endorsement. If you are getting your CDL for the first time, you can test for hazmat at the same time. Either way, you need to pass the hazmat knowledge test before the endorsement appears on your license.

Key Takeaways

  • Mississippi's hazmat test covers federal Department of Transportation rules for labeling, loading, transporting, and documenting hazardous materials.
  • You take the test at a Mississippi Department of Public Safety driver's license office, and you must pass with a score of at least 80 percent.
  • The test has 30 questions drawn from the hazmat section of the CDL manual, and you have one hour to complete it.
  • You will need to pass a background check and provide fingerprints before you can take the hazmat test.
  • The test fee varies by location, so contact your local driver's license office for the exact cost in your county.

What the test covers

The hazmat test is based on the hazmat section of the Mississippi CDL manual, which you can get free from any driver's license office or read from the Mississippi Department of Public Safety website. The test asks about nine main topics: the classes of hazardous materials, how to identify them by label and placard, how to load and unload them safely, how to document shipments, what to do in an emergency, rules about parking and attendance, vehicle equipment requirements, and rules specific to certain materials like explosives or radioactive goods.

Questions are multiple choice with four answer options each. You will see 30 questions total. The test does not ask you to memorize specific chemical names or molecular weights — it focuses on the practical rules a driver needs to follow: what placards go on the vehicle, which materials cannot be loaded together, what paperwork must travel with the load, and how to respond if something spills or catches fire.

Passing score and time limit

You must score at least 80 percent to pass. That means you can miss no more than 6 questions out of 30. You have one hour to take the test. Most people finish in 20 to 40 minutes, so time is not usually a constraint.

If you do not pass on your first attempt, you can retake the test. Mississippi allows you to test again after a waiting period — check with your local driver's license office for the exact number of days you must wait and whether there is an additional fee for a retest.

Background check and fingerprinting requirements

Before you can take the hazmat test, Mississippi requires you to pass a background check and provide fingerprints. This is a federal requirement, not a state one. The background check looks for disqualifying offenses — mainly felonies involving drugs, explosives, or crimes of violence committed within the past three years, though some offenses can disqualify you for longer.

You will submit your fingerprints at the driver's license office when you explore for the hazmat endorsement. The office sends them to the FBI and the Mississippi Department of Public Safety for checking. This process usually takes one to two weeks. You cannot take the hazmat test until the background check comes back clear.

How to prepare for the test

Start with the hazmat section of the Mississippi CDL manual. Read through it once to get familiar with the material, then go back and study the key sections: the nine classes of hazardous materials and their placards, the rules about what materials cannot be transported together, emergency procedures, and documentation requirements. Many people find it helpful to make flashcards of the material classes and their corresponding placards, since the test includes several questions about identifying materials by their labels.

Practice tests are available online through various CDL study sites. These are not official Mississippi tests, but they use the same format and cover the same topics. Taking a practice test under timed conditions — one hour, 30 questions, 80 percent to pass — will show you where you need more study time. Focus your second round of studying on the topics where you scored lowest on the practice test.

What to bring to the test

Bring a valid form of identification — your current driver's license, passport, or state ID card. Bring proof of your Social Security number if you do not have it memorized. Some offices also ask for proof of residency, so call ahead to confirm what your local office requires.

You cannot bring the CDL manual, notes, or any study materials into the testing room. You also cannot use a phone, calculator, or any electronic device during the test. The office will provide scratch paper if you need it to work through a problem.

After you pass

Once you pass the hazmat test, the endorsement is added to your CDL. The hazmat endorsement is valid for five years, the same as your CDL. When you renew your CDL, you will need to pass the hazmat test again if you want to keep the endorsement — there is no separate renewal process.

Your hazmat endorsement will show on your license as an "H" in the endorsement section. Some employers require the hazmat endorsement for certain driving jobs, so having it on your license opens up more job opportunities in transportation and logistics.

Frequently Asked Questions

Can I take the hazmat test if I have a criminal record?

It depends on what the offense was and when it happened. Felonies involving drugs, explosives, or violent crimes within the past three years are disqualifying. Some other offenses may disqualify you for longer. Contact your local Mississippi driver's license office with details of your record, and they can tell you whether you are may be able to access.

What happens if I fail the hazmat test?

You can retake it after waiting the required number of days set by Mississippi. Ask your driver's license office how long you must wait and whether there is a fee for the retest. Use the time to study the topics where you struggled most on your first attempt.

Do I need the hazmat endorsement to drive a commercial truck in Mississippi?

Only if your job involves transporting hazardous materials. If you drive a regular commercial truck carrying non-hazardous cargo, you do not need the hazmat endorsement. Your employer will tell you whether the job requires it.

How much does the hazmat test cost in Mississippi?

The fee varies by county and driver's license office. Call your local Mississippi Department of Public Safety office to find out the exact cost where you plan to test.

Can I take the hazmat test online?

No. The hazmat test must be taken in person at a Mississippi Department of Public Safety driver's license office. You cannot take it remotely or by mail.