U.S. Hazmat Regulations | HAZMAT LINE
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U.S. Hazmat Regulations
Plain-Language Guides

Everything DOT and OSHA require from hazmat shippers — explained without the legal jargon. Select a regulation below to understand what applies to your operation.

DOT — Department of Transportation

49 CFR Part 172
49 CFR Part 172 — Hazmat Shipping Compliance Guide

The federal rulebook every hazmat shipper must follow. Covers all six Part 172 obligations — from shipping papers to the 24-hour emergency phone number.

  • All six Part 172 requirements explained
  • Fully regulated vs. Limited Quantity shipments
  • PHMSA penalties and the real cost of non-compliance
Read the 49 CFR guide
49 CFR §§ 107.601–107.620
DOT Hazmat Registration — The Annual PHMSA Program

Before you ship, you may need to register with PHMSA. This guide covers who must register, current fees, how to file, and what registration does not cover.

  • Who must register — and who is exempt
  • 2025–2026 registration fees and filing timeline
  • Registration vs. Part 172 compliance — the distinction that matters
Read the registration guide
Exemption · LQ
Limited Quantity — When the Exemption Applies

Small shipments of certain hazmat may qualify for reduced requirements under the Limited Quantity exemption. Understand the rules before assuming you're covered:

  • Quantity thresholds by hazmat class
  • Packaging and marking requirements that still apply
  • What LQ does NOT exempt — including the ER number
Read the Limited Quantity guide

OSHA — Workplace & Product Safety

OSHA · 29 CFR 1910.1200
Safety Data Sheet — Emergency Number Requirements

Every SDS Section 1 must include an emergency telephone number. This guide explains the OSHA obligation, how it differs from the DOT shipping paper requirement, and the penalties for non-compliance.

  • Who must have an SDS and what Section 1 requires
  • OSHA SDS obligation vs. DOT shipping paper obligation
  • Penalty exposure by industry and enforcement trends
Read the SDS compliance guide

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