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To minimize threats to life, property or the environment due to hazardous materials related incidents, PHMSA's Office of Hazardous Materials Safety develops regulations and standards for the classifying, handling and packaging of over 1 million daily shipments of hazardous materials within the United States.
DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability. If you require an alternative version of files provided on this page, please contact PHMSA-Accessibility@dot.gov .
The Federal Hazardous Materials Transportation law (Federal Hazmat law), 49 U.S.C. § 5101 et seq., is the basic statute regulating hazardous materials transportation in the United States.
To minimize threats to life, property or the environment due to hazardous materials related incidents, PHMSA's Office of Hazardous Materials Safety develops regulations and standards for the classifying, handling and packaging of over 1 million daily shipments of hazardous materials within the United States.
Regulations, interpretations, rules, approvals and permits, and bulletins for pipeline and hazmat safety. Inspections & Enforcement Incident forms, regional office contacts, and general information on PHMSA enforcement programs.
Hazardous Materials Transportation Training Modules. The Hazardous Materials Transportation Training Modules introduce users to the Hazardous Materials Regulations (HMR; Title 49 CFR Parts 171-180).
HAZMAT Registration Help Desk: 202-366-4109 Hazardous Materials Information Center: 1-800-467-4922 Office of Pipeline Safety Hotline: 202-366-4595 or phmsa.pipelinesafety@dot.gov
This Branch is responsible for improving the quality of existing and future regulations through review and revision. Regulatory modifications take place in response to technological advancements, improved hazardous materials packaging, and changes in economic factors.
Lithium batteries are regulated as a hazardous material under the U.S. Department of Transportation's (DOT) Hazardous Materials Regulations (HMR; 49 C.F.R., Parts 171-180). The HMR apply to any material DOT determines can pose an unreasonable risk to health, safety, and property when transported in commerce.
Office of Hazardous Materials Safety: For questions about transporting hazardous materials, needing clarifications of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180), or requesting a formal letter of interpretation, please go to the Hazardous Materials Information Center (HMIC) page for contact information (phone and email address).