The Hazard Communication Standard, 29 CFR 1910.1200, is OSHA's rule that hazards of workplace chemicals be classified and communicated to workers through labels, safety data sheets, and training. It is the worker right-to-know standard, aligned to the Globally Harmonized System, and one of OSHA's most-cited rules.
Almost every plant has hazardous chemicals, even if it is just cleaners, solvents, and lubricants, so almost every plant is covered by HazCom. It is also one of the standards OSHA cites most often, usually for the same avoidable gaps: no written program, missing safety data sheets, unlabeled containers, untrained workers. This post explains what the standard requires, the six elements that make up a working program, and what the 2024 update changed. It is educational, not legal advice.
What is the Hazard Communication Standard?
The Hazard Communication Standard is OSHA's requirement, at 29 CFR 1910.1200, that chemical manufacturers and importers classify the hazards of the chemicals they produce, and that all employers whose workers may be exposed communicate those hazards through labels, safety data sheets, and training. The logic runs downhill: the manufacturer classifies and documents the hazard, the label and safety data sheet carry it to the workplace, and the employer trains workers to understand and act on it. Workers have a right to know what they are handling and a right to understand how to protect themselves.
HazCom is performance-oriented in one sense and specific in another. It tells you what must be communicated and gives standardized formats for the label and the data sheet, but it leaves the details of your written program and training to fit your operation. That flexibility is why two plants can both comply while looking different, and why an inspector reads your written program first to see whether you actually run one.
What are the six elements of a HazCom program?
A compliant program has six parts that reinforce each other. Treat any one as optional and the chain breaks, because a label points to a data sheet, the data sheet informs the training, and the training only sticks if the chemical is in the inventory and the program says who owns it.
- Written program. A document describing how your facility meets each part of HazCom: who is responsible, how labels and data sheets are handled, and how training is done. It is the first thing an inspector asks for.
- Chemical inventory. A list of the hazardous chemicals present in the workplace, keyed to their safety data sheets by product identifier so every chemical on the floor can be traced to its sheet.
- Labels. Shipped containers carry the full GHS label; workplace and secondary containers carry a compliant label too, covered in depth in GHS labeling.
- Safety data sheets. A 16-section SDS for each hazardous chemical, obtained from the manufacturer and kept readily accessible to workers on every shift.
- Training. Worker training on the hazards, the label and data sheet system, protective measures, and the details of the written program, done at initial assignment and when a new hazard is introduced. Good training connects HazCom to how work actually gets done, so it dovetails with the chemical steps in a task's job safety analysis.
- Access to information. Workers, and their representatives, must be able to get to the safety data sheets and the written program during their shift without barriers.
How does HazCom relate to GHS?
HazCom is OSHA's adoption of the Globally Harmonized System into U.S. law. Before 2012, the United States used its own labeling and material safety data sheet formats, which varied and did not line up with the rest of the world. In 2012 OSHA revised HazCom to align with GHS, which standardized the label elements, adopted the 16-section safety data sheet, and set the classification criteria. The alignment is what makes a label from one supplier readable the same way as a label from another, and it is why the SDS has the same 16 sections everywhere.
The classification step is also where HazCom feeds the rest of your safety system. A chemical's classification tells you what personal protective equipment the task needs, how the material has to be stored and segregated, and what to watch for during a spill. In that sense HazCom is not a standalone paperwork exercise; it is a feeder into your broader hazard identification work, supplying the chemical-hazard half of the picture that inspections and job analyses complete.
The everyday pieces workers touch, the labels and the safety data sheets, are the GHS-standardized outputs of that classification. When people say a chemical is "GHS classified," they mean the manufacturer ran it through the hazard classes and categories that HazCom requires, then produced the standardized label and sheet.
How does hazard information flow from manufacturer to worker?
It moves in one direction, from the people who know the chemistry to the people who handle the product. The manufacturer classifies the hazard, encodes it on the label and the safety data sheet, and ships it. The employer receives it, adds it to the inventory, keeps the sheet accessible, and trains the worker. The worker reads the label, applies the precautions, and pulls the sheet if they need detail. Break any link in that chain, a missing sheet, an untrained worker, a stripped label, and the information stops before it reaches the hand on the container.
What did the 2024 HazCom update change?
OSHA issued a final rule in 2024 that updated HazCom to align with a newer edition of GHS, Revision 7, with some elements of Revision 8. The rule became effective July 19, 2024, and OSHA set staggered compliance deadlines so manufacturers, importers, distributors, and employers have time to update labels, safety data sheets, and training. The changes are refinements rather than a rebuild: updated classification and labeling provisions, clarified rules for small containers and for released-for-shipment materials, and other alignment updates. The core structure, the six-element program, the GHS label, and the 16-section SDS, stays the same.
The practical takeaway for a plant is not to panic but to keep pace: as suppliers reissue labels and safety data sheets under the updated rule, make sure your inventory and your posted sheets reflect the current versions, and refresh training when the changes reach a chemical your workers handle.
Why is HazCom cited so often?
Because the failures are ordinary and easy to let slide. The chemical came in, the drum got used, and the safety data sheet never made it into the binder. A bottle got refilled and nobody relabeled it. A new hire never got the training. None of these takes a dramatic failure; they are the slow drift of a program nobody owns. HazCom lands near the top of OSHA's most-cited list year after year for exactly these gaps, which is why the written program matters: it assigns ownership so the pieces do not fall through.
| Element | Common gap | What an inspector looks for |
|---|---|---|
| Written program | None exists, or it is generic and never updated | A site-specific document naming who owns each element |
| Chemical inventory | Out of date; new chemicals not added | A current list matching what is actually on the floor |
| Labels | Unlabeled secondary containers | Every container identified with its hazards |
| Safety data sheets | Missing sheets; not accessible on shift | A sheet for each chemical, reachable by workers |
| Training | New hires or new hazards not covered | Records showing who was trained and when |
What do the standards say?
The primary sources behind HazCom:
- OSHA's Hazard Communication Standard, 29 CFR 1910.1200 is the rule itself, including the written-program, label, SDS, and training requirements.
- OSHA's Hazard Communication topic page collects the standard, the QuickCards, and guidance on building a program.
- The 2024 final rule in the Federal Register updates HazCom to align with GHS Revision 7 and sets the staggered compliance deadlines.
HazCom's ancestor, the 1983 right-to-know rule, is where the phrase comes from; the 2012 and 2024 updates layered GHS on top of that same principle.
Where a HazCom program falls apart
The written program sits in a binder, the safety data sheets sit in another binder, the inventory lives in a spreadsheet somebody last touched a year ago, and the training records are in a third place. Nothing connects them, so when a chemical changes or a new one arrives, the update happens in one place and not the others, and the program drifts out of compliance without anyone deciding to let it. Harmony is an AI-native layer that connects machines, software, and paperwork into one operational layer, with no rip-and-replace, so the written program, the chemical inventory, the SDS library, and the training records reference the same source of truth instead of four disconnected binders. AI search returns cited answers across those records, so a worker or an inspector can ask for the sheet, the label requirement, or the training history for a chemical and get a cited answer, part of everyday connected worker technology. When a new chemical arrives or a supplier reissues a sheet, Harmony's workflow platform routes the inventory update, the labeling, and the retraining to the people who own them, so the six elements stay in step. It keeps the program honest between safety audits and it does the same for related programs like sanitation chemical safety and the physical side of hazardous chemical storage.