Expert Insights: What does "hazmat" mean to you?
After many years of working with hazardous materials (hazmat), one thing stands out above the rest: hazmat doesn’t mean the same thing to everyone. And while that might sound like a minor issue, it can have serious consequences.
Different agencies and regulations define "hazmat" in different ways, and using the wrong definition in the wrong context can lead to confusion, non-compliance, regulatory violations, leaking packages, or even dangerous incidents. That's why it’s very important to understand which definition of hazmat applies to your specific situation.
Let me give you a real-world example.
I often get questions about whether a driver needs a hazmat endorsement on their CDL. According to the Federal Motor Carrier Safety Administration (FMCSA) regulations, specifically §383.93, a hazmat endorsement is required when transporting hazardous materials as defined in §383.5. That definition states, in part, that a hazardous material is any material designated as hazardous under 49 U.S.C. 5103 and that requires placarding.
So, if you're only concerned with licensing, the key factor is whether the material requires placards. Simple enough, right? But here’s where things get tricky.
Many people mistakenly apply that same definition when trying to comply with the Pipeline and Hazardous Materials Safety Administration (PHMSA) regulations. That’s a big mistake.
PHMSA has its own definition of hazardous materials. According to PHMSA, in part, a hazmat is "a substance or material that the Secretary of Transportation has determined is capable of posing an unreasonable risk to health, safety, and property when transported in commerce." This definition is broader and includes many materials that may not require placards but still fall under the hazmat regulations.
Why does this matter? Because under PHMSA regulations, even if placards aren’t required, you may still be responsible for a wide range of regulatory requirements, such as training, packaging, labeling, marking, and shipping documentation. Overlooking these requirements because you’re using the wrong definition of hazmat can lead to serious compliance issues.
Bottom line
Always make sure you’re using the correct definition of hazmat for the context you’re working in. Whether it’s licensing, shipping, handling, or emergency response, the applicable regulations and the definition of hazmat can vary. Knowing the difference isn’t just helpful, it’s essential for safety and compliance.


















































