PHMSA FAQs

Frequently Asked Questions

The Frequently Asked Questions below have been compiled and grouped by topic. 

In some cases, the same question and answer pair may be in more than one FAQ group to help you locate the information.

• General FAQs
• Privacy Policy FAQs

Hazardous Materials Safety

• Hazardous Materials Information Center (HMIC)
• Hazardous Materials Safety FAQs
• Training FAQs
• Security Training FAQs
• Approvals
• Cylinder Approvals: Overfilling Prevention Device (OPD)
• Fireworks Approvals
• Special Permits
• PHMSA's Online CFR (oCFR)
• Applicability of the Hazardous Materials Regulations
• Frequently Asked Questions: Hazardous Materials Incident Reporting

Pipeline Safety

• Temporary Repair and Permanent Repair FAQs
• Gathering Pipelines FAQs
• General Pipeline FAQs
• PHMSA and Pipelines FAQs