The OSHA Hazard Communication Standard, found at 29 CFR 1910.1200, requires every employer who uses, stores, or distributes hazardous chemicals to classify those chemicals and communicate their dangers to workers. It applies to chemical manufacturers, importers, distributors, and any workplace where employees may be exposed to hazardous substances, including contractors and subcontractors. The standard is one of OSHA’s most frequently cited regulations, and understanding its core requirements is essential for staying compliant.
What the Standard Requires
At its core, the Hazard Communication Standard (often called HazCom) has one goal: make sure every worker who handles or works near hazardous chemicals knows what they’re dealing with and how to protect themselves. It does this by placing obligations on different parties in the supply chain. Chemical manufacturers and importers must evaluate and classify the hazards of chemicals they produce or bring into the country. Distributors must pass that hazard information along to the employers who purchase those chemicals. Employers who don’t manufacture or import chemicals still have to build a workplace program that gets the right information to their workers.
The standard accomplishes this through four interconnected requirements: a written hazard communication program, container labels, safety data sheets, and employee training.
The Written Hazard Communication Program
Every employer covered by the standard must prepare and maintain a written hazard communication program. This document is the backbone of compliance. It must describe how your workplace handles each of the standard’s key requirements: labeling, safety data sheets, and employee training. It also requires you to maintain a complete list of every hazardous chemical known to be present in the workplace. This inventory needs to stay current as chemicals are added or removed.
The written program isn’t meant to sit in a filing cabinet. It must be accessible to employees and, in workplaces with multiple employers (like construction sites or shared facilities), it must also describe how hazard information will be shared between companies.
Label Requirements
Every container of hazardous chemicals leaving a manufacturer, importer, or distributor must carry a label with six specific elements:
- Product identifier: the name or code that matches the chemical to its safety data sheet
- Signal word: either “Danger” for more severe hazards or “Warning” for less severe ones
- Hazard statement(s): standardized phrases describing the nature of the hazard (for example, “causes serious eye damage”)
- Precautionary statement(s): recommended measures to minimize exposure or harm
- Pictogram(s): red-bordered diamond symbols that visually represent hazard categories like flammability, corrosion, or toxicity
- Manufacturer information: the name, address, and telephone number of the responsible party
Workplace containers generally must also be labeled, though employers have some flexibility in how they mark secondary containers as long as the product identifier and hazard information are clear.
Safety Data Sheets
Safety Data Sheets (SDSs) are the detailed reference documents for every hazardous chemical in your workplace. They follow a standardized 16-section format so workers can quickly find the information they need. The first 11 sections are mandatory, while sections 12 through 15 are included for completeness but fall outside OSHA’s jurisdiction:
- Section 1: Identification
- Section 2: Hazard(s) Identification
- Section 3: Composition/Information on Ingredients
- Section 4: First-Aid Measures
- Section 5: Fire-Fighting Measures
- Section 6: Accidental Release Measures
- Section 7: Handling and Storage
- Section 8: Exposure Controls/Personal Protection
- Section 9: Physical and Chemical Properties
- Section 10: Stability and Reactivity
- Section 11: Toxicological Information
- Sections 12–15: Ecological, disposal, transport, and regulatory information (non-mandatory)
- Section 16: Other Information
Employers must keep an SDS for every hazardous chemical on-site and make them readily accessible to employees during their shifts. “Readily accessible” can mean a physical binder in the work area or an electronic system, as long as workers can actually get to the information without barriers when they need it.
Employee Training
Training is required at two points: when an employee first starts working with or near hazardous chemicals (initial assignment), and whenever a new chemical hazard is introduced into their work area. There is no annual retraining mandate built into the standard itself, though many employers choose to refresh training periodically.
The training must cover several specific topics. Employees need to know how to detect the presence or release of a hazardous chemical in their area, whether that’s through monitoring equipment, visual cues, or odor. They need to understand the physical and health hazards of the chemicals they work around, including risks like cancer, asphyxiation, and combustible dust. And they need to know the protective measures available to them: work practices, emergency procedures, and personal protective equipment.
Beyond formal training, employers must also inform workers of three things: the requirements of the HazCom standard itself, which operations in their work area involve hazardous chemicals, and where to find the written hazard communication program, chemical inventory list, and safety data sheets.
How Chemicals Are Classified
The standard divides chemical hazards into two broad categories: physical hazards (like flammability, explosiveness, or reactivity) and health hazards (like toxicity, cancer risk, or reproductive harm). Classification follows a three-step process: gathering data on a chemical’s properties, reviewing that data against established criteria, and determining both whether the chemical is hazardous and how severe the hazard is.
For acute toxicity, chemicals fall into one of four categories based on how much exposure causes harm. Category 1 is the most dangerous. For example, a substance swallowed at a dose of 5 milligrams per kilogram of body weight or less that proves lethal falls into Category 1, while one requiring between 300 and 2,000 milligrams per kilogram lands in Category 4. Similar thresholds exist for skin contact and inhalation. For longer-term health effects like cancer risk, chemicals are classified as known human carcinogens (based on human evidence), presumed carcinogens (based on animal evidence), or suspected carcinogens.
Some of these classifications require expert scientific judgment rather than a simple pass/fail test. All available evidence, including lab studies, animal data, and documented human cases, factors into the final determination.
The 2024 Update
OSHA published a final rule on May 20, 2024 that updated the Hazard Communication Standard to align with the seventh revision of the United Nations’ Globally Harmonized System of Classification and Labelling of Chemicals (GHS). The previous major update in 2012 had aligned the standard with the third revision of the GHS, so this rule closes a significant gap. The changes are designed to improve the quality of information on labels and safety data sheets, address implementation issues that surfaced after 2012, and better align U.S. requirements with those of Canada and other federal agencies.
Penalties for Noncompliance
OSHA adjusts its penalty amounts annually for inflation. As of January 15, 2025, a serious violation of the Hazard Communication Standard can result in a fine of up to $16,550 per violation. Willful or repeated violations carry penalties up to $165,514 per violation. Failure to correct a cited violation within the required timeframe adds $16,550 per day until the issue is resolved. Given that HazCom violations often involve multiple chemicals or missing documents, a single inspection can generate fines that add up quickly across individual citations.