Public Resource Page

Hazardous Materials

Starter page for hazmat transportation resources, training, registration, and safety topics.

What Hazardous Materials Compliance Covers

Any carrier that transports, loads, unloads, or arranges for the transport of hazardous materials (hazmat) is regulated under the Hazardous Materials Regulations (HMR), found in 49 CFR Parts 171–180. These rules — jointly enforced by PHMSA, FMCSA, and roadside inspectors — govern how hazmat shipments are classified, packaged, marked, labeled, placarded, documented, and driven. Getting them wrong carries some of the steepest civil penalties in trucking and can trigger an out-of-service order on the spot.

Key Parts of the Hazardous Materials Regulations

Regulation	What It Covers
49 CFR Part 172	Hazardous materials table, proper shipping names, hazard classes, marking, labeling, placarding, shipping paper content, and hazmat employee training (Subpart H).
49 CFR Part 173	Shipper responsibilities for classifying and packaging hazardous materials before they're offered for transport.
49 CFR Part 177	Carriage by public highway — loading/unloading rules, segregation of incompatible materials, driver attendance and parking restrictions, and in-transit handling.
49 CFR Part 107, Subpart G	PHMSA's annual hazmat registration program for carriers and shippers that transport specified types or quantities of hazardous materials.
49 CFR Part 385, Subpart E	The FMCSA Hazardous Materials Safety Permit (HMSP), required for a narrower set of high-risk shipments (certain radioactive materials, large quantities of explosives, poison-by-inhalation/toxic-by-inhalation materials, and bulk compressed or refrigerated liquefied gases meeting the regulatory thresholds).

Registration, Permits, and Placarding

Two separate federal programs can apply, and carriers sometimes confuse them. PHMSA hazmat registration (49 CFR Part 107, Subpart G) is broader — it applies to most carriers and shippers handling regulated quantities of hazmat and is renewed annually with PHMSA. The FMCSA Hazardous Materials Safety Permit is narrower and only required for the specific high-consequence categories listed in 49 CFR 385.403. Separately, 49 CFR Part 172, Subpart F requires placards on any transport vehicle, freight container, or bulk packaging carrying hazmat above the regulatory quantity thresholds, and Part 172, Subpart C requires shipping papers with the proper shipping name, hazard class, ID number, and a 24-hour emergency response contact.

Hazmat Employee Training (49 CFR Part 172, Subpart H)

Anyone who directly affects hazmat transportation safety — including drivers who load, unload, or transport hazmat — is a "hazmat employee" and must complete training before performing those duties unsupervised (new employees have up to 90 days under direct supervision). Training must cover general awareness/familiarization, function-specific duties, safety, and security awareness, with in-depth security training added for carriers that must maintain a security plan. Recurrent training is required at least once every three years, or sooner if job duties change. Employers must keep training records on file for the current employee plus 90 days after separation.

FMCSA Hazardous Materials program (fmcsa.dot.gov)

Frequently Asked

Does every carrier that hauls hazmat need a Hazardous Materials Safety Permit?

No. Most hazmat shipments only require standard placarding, shipping papers, and hazmat employee training. The HMSP applies to a narrower list of high-risk categories under 49 CFR 385.403 — certain radioactive materials, large quantities of explosives, poison/toxic-by-inhalation materials, and bulk compressed or refrigerated liquefied gases above specified thresholds.

How often do drivers need hazmat refresher training?

At least once every three years under 49 CFR 172.704, or sooner if the driver's job functions change in a way that affects the hazmat duties they perform.

What happens if a hazmat shipment is found out of compliance at roadside?

Inspectors can place the vehicle or shipment out of service, and hazmat violations frequently carry higher civil penalties than comparable non-hazmat violations. Missing shipping papers, wrong or missing placards, and incompatible loading are among the most common findings.

Free Resources

Hazardous Materials Markings, Labeling and Placarding Guide FMCSA / PHMSA
Visual reference chart of required markings, warning labels, and placards for hazmat shipments and vehicles.
Hazardous Materials Brochures FMCSA
Free downloadable guides on hazmat highway transport, safety permits, and materials-of-trade exemptions.