49 CFR 172 Subpart H: DOT Hazmat Employee Training

Regulatory citation: 49 CFR Part 172, Subpart H, Training (sections 172.700 to 172.704), Pipeline and Hazardous Materials Safety Administration (PHMSA) Hazardous Materials Regulations

What Is the PHMSA Hazmat Employee Training Rule?

Subpart H of Part 172 requires every hazmat employer to train, test and certify each hazmat employee before that person performs any job function covered by the Hazardous Materials Regulations (HMR). It is one of the broadest rules in the HMR because it applies to anyone whose work directly affects hazardous materials transportation safety, not only drivers. The rule covers transport by highway, rail, air and water.

A hazmat employer is a person who employs or uses at least one hazmat employee to transport hazardous materials in commerce, cause them to be transported, or represent, mark, certify, sell, offer, manufacture, recondition, test, repair or modify packagings as qualified for hazmat use. A hazmat employee is anyone, including a self-employed person, who loads, unloads or handles hazardous materials, designs, makes, tests or reconditions packagings, prepares hazardous materials for transport, is responsible for transport safety, or operates a vehicle used to transport hazardous materials. Shipping clerks, warehouse loaders, people who fill out shipping papers and staff who select packaging all count.

Why Hazmat Training Matters

Most hazmat incidents start with a human error, such as the wrong packaging, a missing label, incompatible materials loaded together or a shipping paper that leaves responders guessing. Training is the foundation of every other HMR requirement. Failure to train is also one of the most frequently cited HMR violations in PHMSA enforcement cases, and it is often cited alongside packaging, marking and shipping paper violations that training would have prevented.

Core Obligations

1. Train, Test and Certify Every Hazmat Employee (172.702)

A hazmat employer must ensure that each hazmat employee is trained in accordance with Subpart H, tested by appropriate means on the training subjects, and certified as trained and tested. A hazmat employee may not perform a covered function unless trained in the requirements that apply to that function. Training can be delivered by the employer or by outside public or private sources, but the employer remains responsible for making sure it is complete and recorded.

2. Provide General Awareness and Familiarization Training (172.704(a)(1))

Every hazmat employee must receive general awareness training that gives familiarity with the HMR and helps the employee recognize and identify hazardous materials. Typical topics include the hazmat table, hazard classes, shipping papers, markings, labels, placards and the purpose of emergency response information.

3. Provide Function-Specific Training (172.704(a)(2))

Each employee must be trained in the specific HMR requirements that apply to the functions they perform. A person who classifies materials and prepares shipping papers needs different training from a forklift operator who loads trailers or a driver who transports placarded loads. Function-specific training must also cover any special permit requirements and relevant international or modal rules the employee follows, such as the ICAO Technical Instructions for air shipments or the IMDG Code for vessels.

4. Provide Safety Training (172.704(a)(3))

Safety training must cover emergency response information required by Subpart G of Part 172, measures to protect the employee from the hazards of the materials they may be exposed to at work, including specific measures the employer has put in place, and methods and procedures for avoiding accidents, such as proper handling of packages.

5. Provide Security Awareness and In-Depth Security Training (172.704(a)(4) and (a)(5))

Every hazmat employee must receive security awareness training covering the security risks of hazmat transport, methods to improve transport security, and how to recognize and respond to possible security threats. If the employer must have a security plan under Subpart I of Part 172, each employee must also receive in-depth security training on the plan, including company security objectives, specific security procedures, employee responsibilities, actions to take in a security breach and the organizational structure for security.

6. Add Modal Training for Drivers and Others (172.704(a) and 177.816)

Drivers of motor vehicles transporting hazardous materials need additional training under 177.816, covering pre-trip safety inspections, use of vehicle controls and equipment including emergency equipment, vehicle operation including procedures for tunnels, bridges and railroad crossings, attendance, parking, smoking, routing and incident reporting, and loading and unloading. Cargo tank drivers need training on tank-specific operation, retesting and emergency procedures. Rail, air and vessel personnel have their own added training rules.

7. Meet the Timing Rules (172.704(c))

A new hazmat employee, or one who changes job functions, may perform hazmat functions before completing training only under the direct supervision of a properly trained and knowledgeable hazmat employee, and training must be completed within 90 days of employment or the change in job function. Recurrent training is required at least once every 3 years. If a new or changed regulation applies to an employee's functions, training on that change must be provided by the compliance date, regardless of where the employee is in the 3-year cycle. For in-depth security training, if the security plan is revised during the 3-year cycle, employees must be trained on the changes within 90 days of the revised plan's implementation.

8. Recognize Equivalent Training (172.704(b))

Training done to meet OSHA, EPA or other federal or international standards, such as HAZWOPER or hazard communication training, may be used to satisfy part of the HMR requirement, but only to the extent it covers the specific subjects required by 172.704. It does not replace HMR function-specific training on classification, packaging, marking, labeling, papers or placarding.

9. Keep Training Records (172.704(d))

Each hazmat employer must create and keep a record of current training for each hazmat employee, covering the preceding 3 years, for as long as the employee is employed as a hazmat employee and for 90 days afterward. The record must include the employee's name, the most recent training completion date, a description, copy or location of the training materials used, the name and address of the person providing the training, and a certification that the employee has been trained and tested. Records must be made available to authorized DOT officials on request.

Common Compliance Approaches

Map Every Hazmat Function

List every job that touches hazardous materials, including purchasing, customer service staff who arrange shipments, maintenance staff who ship parts with batteries or aerosols, and returns processing. Then match each role to the training modules it needs.

Build a 3-Year Training Matrix

Track each employee's general, function-specific, safety, security and modal training dates and set reminders well before the 3-year deadline. Include supervisors who sign off on shipments.

Test With Real Tasks

Use practical tests, such as having employees classify a product, select packaging or complete a shipping paper, in addition to written quizzes. Keep test results with the training record.

Retrain After Changes

When PHMSA publishes amendments, such as international harmonization rules, or when an employee moves to a new role, schedule focused training before the compliance date or within 90 days of the job change.

Example: Hazmat Training in Practice

A specialty chemical distributor ships corrosive and flammable liquids by truck and occasionally sends lithium battery samples by air. After a PHMSA inspection finds that two warehouse loaders and a customer service representative who prepares shipping papers have never been trained, the company builds a training matrix. All hazmat employees complete general awareness, safety and security awareness training. Loaders receive function-specific training on segregation, blocking and bracing, and placarding. Shipping staff train on classification, packaging selection and shipping papers. The one employee who prepares air shipments completes training on the ICAO Technical Instructions. Each employee passes a test, and the safety coordinator stores the certification records with the course materials and trainer details. New hires work under a trained employee's direct supervision until their training is complete, always within 90 days.

Related regulations: OSHA Hazard Communication, OSHA HAZWOPER, EPA hazardous waste transporters.

Note: This summary covers PHMSA's Hazardous Materials Regulations for transport in the United States. PHMSA enforces the training rules across all modes, and FMCSA, FRA, FAA and the Coast Guard also enforce them for their modes. Civil penalties are adjusted each year for inflation. PHMSA notices issued in 2026 cite a minimum of $617 per training violation and a maximum of $102,348 per violation, with each day of a continuing violation a separate offense. Always check the current regulation text and PHMSA guidance.

Frequently Asked Questions

Who counts as a hazmat employee?

Anyone whose job directly affects hazardous materials transportation safety, including people who load, unload or handle hazmat, prepare it for shipment, fill out shipping papers, select or test packagings, or drive vehicles carrying hazmat. Self-employed people and subcontractor employees are included.

How often is hazmat training required?

Within 90 days of hire or a job change, and at least once every 3 years after that. Additional training is required when a regulation change affects the employee's functions.

Does PHMSA require trainers to be certified?

No. PHMSA does not set minimum qualifications for hazmat trainers, but the trainer must be able to cover the required subjects, and the employer must record the trainer's name and address.

Can an employee pass a test instead of taking the training?

No. PHMSA has said an employee cannot simply pass an exam to have the training requirement waived. Training must cover the required areas, and testing confirms the employee understood it.