29 CFR 1910.1200: OSHA Hazard Communication Standard (HazCom)

Regulatory citation: 29 CFR 1910.1200

OSHA Hazard Communication Standard: 29 CFR 1910.1200

The Hazard Communication Standard (HazCom), found at 29 CFR 1910.1200, requires employers to inform and train employees about the hazardous chemicals they may be exposed to in the workplace. Often referred to as the "employee right-to-know" standard, HazCom is one of the most frequently cited OSHA standards across nearly every industry that uses, stores, or handles chemicals.

HazCom is built around a globally harmonized system (GHS) for chemical classification, which standardizes how hazards are communicated through labels, pictograms, and safety data sheets, both within the U.S. and internationally.

Why HazCom Exists

Before HazCom, chemical hazard communication varied widely between manufacturers, suppliers, and workplaces, leading to confusion and inconsistent safety practices. By standardizing classification criteria and communication formats, HazCom ensures that a hazardous chemical is labeled and documented consistently, regardless of where it's manufactured or used.

Core Requirements of the Hazard Communication Standard

1. Written Hazard Communication Program

Employers must maintain a written HazCom program describing how labeling, safety data sheets, and employee training requirements will be met at their specific facility.

2. Safety Data Sheets (SDS)

Employers must maintain a Safety Data Sheet for every hazardous chemical present in the workplace, accessible to employees during all work shifts. SDSs follow a standardized 16-section format covering identification, hazards, composition, handling, and emergency measures.

3. Container Labeling

All hazardous chemical containers must be labeled with the product identifier, appropriate pictograms, a signal word (danger or warning), hazard statements, and precautionary statements, consistent with GHS labeling requirements.

4. Employee Training

Employees must be trained before initial assignment involving hazardous chemicals, and again whenever a new hazard is introduced into their work area. Training must cover how to read labels and SDSs, and how to protect themselves from exposure.

Building a Compliant HazCom Program

Maintain a Master Chemical Inventory

An accurate, up-to-date inventory of every hazardous chemical present in the facility is the foundation of a compliant HazCom program. This inventory should be cross-referenced against your SDS library regularly.

Centralize and Digitize SDS Access

While paper SDS binders remain common, many employers now use digital SDS management systems, ensuring accessibility across shifts and locations without relying on a single physical binder that could be misplaced or outdated.

Standardize Secondary Container Labeling

A common compliance gap involves secondary containers, chemicals transferred from a labeled original container into a smaller, unlabeled one. HazCom requires labeling for these secondary containers as well, unless they're used immediately by the same employee who filled them.

Refresh Training Regularly

Beyond the minimum requirement of training before initial exposure, many employers schedule annual refresher training to reinforce label and SDS literacy, particularly in facilities with high employee turnover.

Example: HazCom in Practice

A manufacturing facility receives a new industrial cleaning solvent. Under HazCom, the facility must first obtain and file the SDS for the new chemical, add it to the facility's chemical inventory, ensure all containers, including any secondary spray bottles used on the production floor, are properly labeled with GHS pictograms and hazard statements, and train employees who will handle the solvent on its specific hazards and required precautions before it's introduced into the workflow.

Frequently Asked Questions

What is the OSHA Hazard Communication Standard?

The OSHA Hazard Communication Standard, found at 29 CFR 1910.1200, is a regulation requiring employers to communicate information about hazardous chemicals to their employees through standardized labeling, safety data sheets, and training. Often called the "right-to-know" standard, it ensures that anyone working with or near hazardous chemicals has access to clear, consistent information about the risks involved and how to protect themselves. The standard is aligned with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS), which standardizes hazard classification and communication formats across countries, making it easier for multinational supply chains to maintain consistent safety information. Compliance requires more than simply having safety data sheets on file; it requires an active program of labeling, training, and accessible documentation that employees can genuinely use to understand and manage chemical risks in their day-to-day work.

What needs to be included on a chemical label under HazCom?

Under HazCom, every hazardous chemical container must include several standardized elements: a product identifier matching the chemical's Safety Data Sheet, one or more GHS pictograms representing the specific hazards involved (such as flammability, corrosivity, or health hazards), a signal word of either "danger" for more severe hazards or "warning" for less severe ones, hazard statements describing the nature of the risk, and precautionary statements explaining how to avoid or respond to exposure. Additionally, labels should include the name, address, and phone number of the chemical manufacturer, importer, or other responsible party. This standardized format ensures that regardless of who manufactures a chemical or where it's used, employees encounter consistent, recognizable hazard information, which is a core goal of the GHS-aligned HazCom system.

Do secondary containers need to be labeled under HazCom?

Secondary containers, meaning containers into which a hazardous chemical has been transferred from its original, labeled container, generally need to be labeled under HazCom, with one key exception. If the employee who transfers the chemical into the secondary container will use it entirely during their current work shift, and maintains control of it throughout that time, labeling isn't strictly required by the federal standard. However, once that immediate-use exception doesn't apply, for example, if the container will be used across multiple shifts, stored for later use, or handled by other employees, it must be labeled with at minimum the identity of the chemical and appropriate hazard information. Many employers choose to label all secondary containers as a matter of practice, since it removes ambiguity and reduces the risk of a mislabeled or unlabeled container causing confusion or exposure down the line.

How often does HazCom training need to be provided?

HazCom training is required before an employee is initially assigned to work involving hazardous chemicals, and again whenever a new hazard is introduced into their work area that they haven't previously been trained on, such as a new chemical or a newly identified hazard associated with an existing chemical. While the standard doesn't mandate a fixed annual retraining schedule the way some other OSHA standards do, many employers choose to provide refresher training annually as a best practice, particularly in facilities with significant employee turnover, seasonal staffing changes, or a wide range of chemicals in use. Training must cover how to read and understand chemical labels and Safety Data Sheets, the physical and health hazards of chemicals in the work area, and the specific protective measures available to employees, including engineering controls, work practices, and personal protective equipment.