🚛 CDL Hazmat Endorsement
Pass the Hazmat Endorsement Test on Your First Try.
1,000+ practice questions covering every topic the FMCSA tests — hazmat classes, placard rules, shipping papers, and security plans. Free to start. First-time pass rate among app users: 91%.
Free to download · No credit card · iPhone & iPad
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1,000+
Practice Questions
12
Topics Covered
91%
First-Try Pass Rate
Free
To Start
About the CDL Hazmat Endorsement Exam
The Hazmat (H) endorsement is required for any CDL driver transporting hazardous materials as defined by FMCSA regulations under 49 CFR. The written exam is administered at your state DMV and is based on the same federal regulations in all 50 states — meaning this app is valid wherever you test.
The exam has 30 questions and requires an 80% passing score (24 correct). Five main areas are tested: hazmat classification and placards, communication requirements (labels, markings, shipping papers), loading and unloading rules, bulk packaging rules, and driver and carrier security plans.
Unlike other CDL endorsements, Hazmat also requires a TSA background check. You'll apply separately at a TSA enrollment center — processing takes 2–4 weeks. If you fail the written test, most states allow you to retake it after 24 hours with no limit on retakes (though fees apply each time).
What the App Covers
App Features
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CDL Hazmat Test Facts by State
The written exam is based on federal FMCSA regulations — the same questions appear in all 50 states. The table below shows exam administration details for the top CDL states.
| State | Questions | Passing Score | Test Fee | Retake Wait |
|---|---|---|---|---|
| Texas | 30 | 80% | $11 | 24 hours |
| California | 30 | 80% | $38 | 7 days |
| Florida | 30 | 80% | $10 | 24 hours |
| Illinois | 30 | 80% | $20 | 24 hours |
| Ohio | 30 | 80% | $25 | 24 hours |
| Pennsylvania | 30 | 80% | $25 | 24 hours |
| New York | 30 | 80% | $64.25 | 24 hours |
| Georgia | 30 | 80% | $32 | 24 hours |
* Fees and policies subject to change. Verify with your state DMV before scheduling.
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2-Week Study Plan — Pass the Hazmat Test First Try
Most drivers who pass on the first try study 45–60 minutes/day for 2 weeks. Here's the exact schedule:
Week 1 — Days 1–2
Hazmat Classification
Learn all 9 hazard classes, packing groups I–III, and forbidden materials. Do 30 classification practice questions. Target: 80% accuracy.
Week 1 — Days 3–4
Placards & Labels
Master placarding thresholds (1,001 lbs rule), label requirements, and exemptions. Use the DOT Placard Guide tool at voltexam.com/tools/hazmat-placard.
Week 1 — Days 5–7
Shipping Papers
Learn bill of lading requirements, emergency response phone numbers, hazmat description order, and the FAST placard exception.
Week 2 — Days 1–3
Loading, Unloading & Security
Study loading rules, segregation requirements, bulk vs non-bulk packaging, and the 4-part carrier security plan requirement.
Week 2 — Days 4–5
TSA Background Check & Driver Rules
Review driver responsibilities, HM-181, and TSA enrollment process. Know: 30-day advance application, fingerprinting, and disqualifying offenses.
Week 2 — Days 6–7
Full Timed Practice Exams
Take 3 full 30-question timed exams at 80%+ accuracy. Review every wrong answer. Schedule your real test when you hit 85%+ consistently.
Frequently Asked Questions
How hard is the CDL Hazmat endorsement test?
The national first-time pass rate is around 68%. Most failures come from the placard rules and security plan sections — both of which the app covers in depth. With 2–3 weeks of practice using the app, most drivers pass on their first attempt.
How many questions is the Hazmat endorsement exam?
Most states use a 30-question exam with a passing score of 80% (24 correct). Some states have 25 questions. You have about 45 minutes. The app's timed mode simulates the exact pressure of the real test.
Do I need a background check for the Hazmat endorsement?
Yes — the TSA requires a background check for the Hazmat H endorsement. Apply at a TSA enrollment center before or alongside your written test. Processing takes 2–4 weeks. Plan ahead.
Is this the official DMV exam? Will these exact questions be on my test?
These are not official DMV questions — we cannot publish those. Our questions are written by CDL instructors to cover the same material the DMV tests, based on the FMCSA regulations and state exam blueprints.
Which states does this app cover?
The Hazmat endorsement is based on federal FMCSA regulations — the same across all 50 states. The app is valid regardless of which state you're testing in.
How long should I study?
Most drivers who pass on their first try spend 10–15 hours studying over 2 weeks. The app tracks your weak areas so you spend time where it counts. Aim for 80%+ accuracy in practice before you schedule your real test.
What happens if I fail the hazmat endorsement test?
Most states allow you to retake the hazmat written test after 24 hours (California requires 7 days). You'll pay the exam fee again each time. There's no limit on the number of retakes in most states. Focus your review on the topics you missed — placard rules and security plans are the most common failure points.
How long does the TSA hazmat background check take?
The TSA Security Threat Assessment (STA) typically takes 2–4 weeks to process. Apply at a TSA enrollment center (often located at a UPS Store or enrollment provider). You'll submit fingerprints and pay a $86.50 federal fee. The background check covers criminal history and immigration status. You can still take the written exam while your background check is pending.
How long is the CDL hazmat endorsement valid?
Your CDL hazmat endorsement is valid for the same period as your CDL — typically 4–5 years depending on your state. At each renewal, you must pass the hazmat knowledge test again AND complete a new TSA background check. Plan for 2–4 weeks of background check processing time before your CDL expiration.
Does the hazmat endorsement cover all types of hazardous materials?
Yes — the H endorsement covers all 9 DOT hazard classes: explosives, gases, flammable liquids, flammable solids, oxidizers, poisons, radioactive materials, corrosives, and miscellaneous hazardous materials. Some materials (like certain poisons and radioactive materials) require additional endorsements or certifications beyond the basic H endorsement.
Free CDL Hazmat Practice Questions by Topic
Classification, placards, shipping papers, and security plans — no app required
CDL Hazmat Endorsement — Common Questions
What is on the CDL Hazmat endorsement test?
The CDL Hazmat endorsement test covers hazardous materials regulations under 49 CFR Parts 171–180. Topics include the nine DOT hazard classes, placarding requirements and thresholds, shipping paper completion, emergency response, loading and unloading rules, and security plans. Most states administer 30 questions with a 70–80% passing score requirement through Prometric or the state DMV.
How many questions are on the CDL Hazmat endorsement exam?
The CDL Hazmat endorsement exam is typically 30 multiple-choice questions. Passing requires 70–80% correct depending on your state. The exam is administered by your state DMV or a third-party tester like Prometric. You must also pass a TSA background check (Transportation Security Clearinghouse) before the endorsement is added to your CDL.
How hard is the CDL Hazmat endorsement test?
The CDL Hazmat endorsement test is moderately difficult. Most CDL holders who study 10 to 20 hours pass on their first attempt. The hardest sections are hazard class identification, placard threshold quantities, and shipping paper requirements. Candidates who fail often miss placarding weight thresholds and emergency response procedures. Practice with 100 or more exam-style questions before testing.
Can I get the Hazmat and Tanker endorsements at the same time?
Yes — CDL endorsements are independent and you can test for multiple on the same DMV visit. The Hazmat (H) and Tanker (N) endorsements combine into the X endorsement, which is required for drivers hauling liquid hazardous materials in bulk tanks. To earn the X endorsement, you pass both the Hazmat and Tanker knowledge tests and complete the TSA background check required for Hazmat. Most drivers schedule both tests on the same day to avoid paying the DMV fee twice.
What is the best CDL Hazmat endorsement study app?
CDL Hazmat Prep by VoltExam is a top-rated app for the CDL Hazmat endorsement test with 1,000 or more practice questions covering all 49 CFR topics, a built-in DOT Hazmat Placard Guide for all nine hazard classes, and full offline access. Available on iOS and Android. Free to start with no credit card required.