How often is Hazard Communication training required?
Updated October 16, 2026
Under 29 CFR 1910.1200(h)(1), employers must train employees on hazardous chemicals at initial assignment and whenever a new chemical hazard they have not been trained on is introduced into their work area. The standard sets no annual refresher interval.
The two required training points
29 CFR 1910.1200(h)(1) requires employers to provide employees with effective information and training on hazardous chemicals in their work area "at the time of their initial assignment, and whenever a new chemical hazard the employees have not previously been trained about is introduced into their work area."
The same paragraph allows training to be designed around categories of hazards (for example, flammability or carcinogenicity) or around specific chemicals. Chemical-specific information must always be available through labels and safety data sheets.
Is annual HazCom training required?
No. Paragraph (h) does not set a fixed refresher interval. Retraining is tied to events: a new employee, or a new chemical hazard in the work area. A new product that presents only hazards employees were already trained on does not, by the text of (h)(1), trigger new training.
Many employers run annual refreshers as a matter of policy. That is an internal choice, not a requirement of 1910.1200. Other standards that cover specific chemicals may set their own training schedules; this guide covers only the general HazCom standard.
What the training must cover
Under 1910.1200(h)(3), training must include at least: methods and observations used to detect the presence or release of a hazardous chemical in the work area; the physical, health, simple asphyxiation, combustible dust, and pyrophoric gas hazards of chemicals in the work area, along with hazards not otherwise classified; the measures employees can take to protect themselves, including work practices, emergency procedures, and PPE; and the details of the employer's hazard communication program, including the labeling system, safety data sheets, and how employees can obtain and use the information.
The rule says training must be "effective." It does not prescribe a delivery format, a minimum length, or a test.
The 2024 update and its compliance dates
OSHA revised the Hazard Communication Standard effective July 19, 2024, per 1910.1200(j)(1). The revision added a one-time training obligation for hazards newly identified under the updated classification rules.
Under 1910.1200(j)(2)(ii), employers must update alternative workplace labeling and their hazard communication program as necessary, and provide additional employee training for newly identified physical, health, or other covered hazards, by November 20, 2026 for substances. Under 1910.1200(j)(3)(ii), the same obligations apply to mixtures by May 19, 2028.
These dates follow the deadlines for manufacturers, importers, and distributors to reclassify and update labels and safety data sheets: May 19, 2026 for substances under (j)(2)(i) and November 19, 2027 for mixtures under (j)(3)(i).
Recordkeeping
1910.1200 does not require a written training certification or specify training records. The written hazard communication program required by 1910.1200(e)(1) must describe how the training requirements of paragraph (h) will be met. Keeping dated attendance or completion records is a common way to show that training happened, but the standard itself does not mandate a particular record.