Hazardous Materials Endorsement: Complete Guide for 2026
CDL Answers Team
Written by CDL holders and exam prep experts · Updated May 2026
The HAZMAT (Hazardous Materials) endorsement is a CDL credential that lets drivers transport regulated dangerous goods like chemicals, fuels, and explosives. It requires a 30-question knowledge test, an 80% passing score, and a TSA Security Threat Assessment that includes fingerprinting. The federal TSA fee is $86.50; state knowledge-test and endorsement fees vary.
Quick Facts
| Questions | 30 |
| Passing score | 80% |
| Time limit | ~30 minutes |
| Cost | $86.50 federal TSA fee (UES centers); state fees vary |
| Prerequisites | Valid CDL (any class); US citizen or lawful permanent resident; TSA threat assessment |
Who needs the Hazardous Materials endorsement?
- Fuel and tanker drivers transporting gasoline, diesel, or chemicals
- Drivers hauling placarded hazardous materials in any quantity that requires placards
- Drivers carrying any quantity of select agents or toxins identified by HHS or USDA
- Drivers transporting Class 7 radioactive materials
- Drivers carrying any quantity of explosives in Division 1.1, 1.2, or 1.3
How to get the Hazardous Materials endorsement
- 1
Apply for the H endorsement at your state DMV
Submit a CDL application at your state DMV indicating you want to add the HAZMAT (H) endorsement. Most states require you to do this in person and pay the state's endorsement application fee.
- 2
Schedule a TSA Security Threat Assessment
Apply online at universalenroll.dhs.gov for the HazMat Endorsement Threat Assessment. Pick a fingerprinting appointment at an IdentoGO enrollment center near you.
- 3
Get fingerprinted at IdentoGO
Bring required identity documents (passport, driver's license, etc.) and your CDL to the enrollment center. The TSA fee is paid at this step. Fingerprints are submitted to TSA for the threat assessment.
- 4
Study for the 30-question HAZMAT test
Review your state's CDL HazMat manual and practice with sample questions. Focus on hazard classes, placards, shipping papers, emergency response, and loading/unloading rules.
- 5
Pass the HAZMAT knowledge test (24/30 = 80%)
Take the test at your state DMV testing location. The test is 30 multiple-choice questions; you must score 80% or better. Many states allow free retakes after a short waiting period if you fail.
- 6
Receive TSA approval and add the endorsement
After TSA clears your threat assessment (typically 30-60 days), your state DMV adds the H endorsement to your CDL. Pay any remaining state endorsement fees and you're licensed to haul HazMat.
What HazMat Drivers Actually Transport
HazMat is the only CDL endorsement built around what's in the cargo, not how the vehicle moves. The Department of Transportation divides hazardous materials into 9 classes — explosives, gases, flammable liquids, oxidizers, and others — and each class has its own placards, handling rules, and emergency response procedures.
Because cargo type drives everything in HazMat, the test focuses on recognizing the 9 classes, knowing what placards mean, understanding shipping papers, and following emergency response procedures. You don't need to memorize specific chemicals — you need to understand the system that classifies them and the rules each class triggers.
Should you get H or X? (HazMat alone vs HazMat + Tanker combined)
The X endorsement is the federal CDL code for the combined HazMat + Tanker (N) endorsement. If you'll haul placarded hazardous materials in a tank vehicle of 1,000+ gallons aggregate capacity (fuel, chemicals, food-grade liquids), you need both H and N — and X is the single endorsement that covers them. If you'll only haul HazMat in drums, totes, or boxes, plain H is enough. For Tanker handling specifics — surge, baffles, outage — see the Tanker endorsement guide.
| Feature | H (HazMat) | X (HazMat + Tanker) |
|---|---|---|
| What it covers | HazMat only | HazMat AND Tanker (combined endorsement) |
| Knowledge tests required | 1 (HazMat, 30 questions) | 2 (HazMat 30 + Tanker 20 questions) |
| TSA threat assessment | Required | Required (same TSA process as H) |
| When you need it | Placarded HazMat in any vehicle | Placarded HazMat in a tank vehicle (≥1,000 gal aggregate) |
| Typical use case | Box truck or trailer hauling drums of chemicals | Fuel truck, chemical tanker, or any liquid HazMat in bulk |
Study tips for the Hazardous Materials test
- 1Focus on DOT regulations - they're heavily tested
- 2Memorize the 9 hazard classes and their symbols
- 3Practice reading shipping papers and manifests
- 4Understand emergency response procedures
- 5Review state-specific HAZMAT routing restrictions
- 6Complete TSA background check and fingerprinting at authorized centers
Topics on the Hazardous Materials test
Hazardous Materials Regulations
~9 questions
- DOT regulations and requirements
- Hazard classes and divisions
- Shipping papers and manifests
Safety Procedures
~7 questions
- Loading and unloading procedures
- Emergency response protocols
- Personal protective equipment
Vehicle Requirements
~6 questions
- Placarding requirements
- Vehicle inspection procedures
- Equipment specifications
Documentation
~5 questions
- Shipping papers
- Emergency response information
- Record keeping requirements
Emergency Response
~3 questions
- Spill containment procedures
- Emergency contacts and reporting
Ready to study?
Practice with real Hazardous Materials CDL exam questions and detailed explanations.
Take the Hazardous Materials Practice Test →Career outcomes
By the numbers
The TSA HME Threat Assessment fee is $86.50 for new and renewing applicants enrolled at a Universal Enrollment Services (UES) center, effective January 1, 2025. Drivers with a valid TWIC pay a reduced rate of $41.00.
Source: TSA / Federal Register
TSA recommends applying for the HazMat endorsement at least 60 days before you need it; processing can exceed 45 days during periods of high demand.
The DOT recognizes 9 hazard classes for materials in transportation, defined under 49 CFR Part 173 and listed in the Hazardous Materials Table at 49 CFR 172.101.
Source: eCFR (49 CFR 172.101)
The median annual wage for heavy and tractor-trailer truck drivers was $57,440 in May 2024, with the top 10% earning more than $78,800.
Source: U.S. Bureau of Labor Statistics, Occupational Outlook Handbook
Permanent HazMat disqualifiers under 49 CFR 1572.103(a) include espionage, sedition, treason, federal crimes of terrorism, transportation security incidents, certain explosives offenses, murder, and RICO violations involving these crimes. The full list, plus 7-year interim disqualifiers, is published in the eCFR.
Source: eCFR (49 CFR 1572.103)
Frequently asked questions
How much does the HAZMAT endorsement cost in 2026?
The federal TSA HazMat threat assessment fee is $86.50 at Universal Enrollment Services enrollment centers (or $41 with a valid TWIC). State CDL endorsement and knowledge-test fees vary widely - check your state DMV's CDL fee schedule for the local total. Non-UES states use a separate TSA fee schedule.
How long does HAZMAT TSA fingerprinting take to process?
TSA recommends applying at least 60 days before you need the endorsement. Processing can exceed 45 days during periods of high demand. Applicants with criminal-history records may take longer because TSA must resolve flags before clearing the threat assessment. You cannot have the endorsement added until TSA approves.
What disqualifies you from getting a HAZMAT endorsement?
Permanent disqualifiers include espionage, terrorism, treason, sedition, transportation security incidents, and certain RICO and murder convictions. Interim disqualifiers (typically 7 years from conviction or 5 from prison release) include felony drug distribution, certain violent felonies, and major fraud. Full list in 49 CFR § 1572.103. Waivers are possible.
How often do I need to renew my HAZMAT endorsement?
The federal maximum is every 5 years - that's the longest a HazMat endorsement can be valid. Some states impose shorter renewal cycles tied to their CDL renewal schedules. Each renewal triggers a new TSA threat assessment and a fresh $86.50 federal fee plus state renewal costs. File at least 60 days before expiration.
Can I take the HAZMAT knowledge test online?
No. The HazMat knowledge test is a CDL-component test administered at your state DMV's testing location. Online practice tests are useful for studying, but the official 30-question test must be taken in person under DMV supervision.
What's the difference between the H and X CDL endorsements?
The H endorsement covers HazMat alone (30-question knowledge test). The X endorsement is a combined HazMat + Tanker endorsement (both knowledge tests, 50 questions total). If you'll haul placarded HazMat in a tank vehicle of 1,000+ gallons aggregate, X is more efficient than getting H and N separately.
Do I need a HAZMAT endorsement to drive a fuel truck?
Yes, if the vehicle requires placards under 49 CFR Subchapter C - which most fuel trucks do. Diesel, gasoline, and most fuels are placarded loads. Drivers hauling them need both the HazMat (H) endorsement and, if the tank is 1,000+ gallons aggregate, the Tanker (N) endorsement (or the combined X).
Can felons get a HAZMAT endorsement?
Sometimes. Permanent disqualifying felonies (terrorism, espionage, certain RICO/murder, transportation security incidents) bar applicants for life. Interim disqualifying felonies bar applicants for 7 years from conviction or 5 from release. After those windows pass, applicants are eligible. TSA waivers are available case-by-case for some offenses.
How many questions are on the HAZMAT CDL test?
The HazMat knowledge test is 30 multiple-choice questions. You must answer 24 correctly (80%) to pass. Topics include the 9 DOT hazard classes, placarding rules, shipping papers, loading and unloading, emergency response, and route restrictions.
What states have additional HAZMAT requirements beyond federal?
States can add their own background-check requirements, in-state training, or routing restrictions. California, New York, and Illinois are common examples of states with extra steps. Always check your state DMV's CDL HazMat page before applying so you don't get surprised mid-process.