OSHA’s November 20 Hazard Communication Deadline: What Employers Need to Know

Employers covered by federal OSHA face a November 20, 2026, deadline to make certain updates under the agency's revised Hazard Communication Standard. For hazardous chemical substances, employers must update workplace labeling and their hazard communication programs as necessary, and provide additional employee training on newly identified hazards. The revised standard took effect in July 2024, with phased compliance deadlines. November 20 is the upcoming employer compliance date for substances.

The revisions primarily align OSHA's standard with the seventh revision of the United Nations' Globally Harmonized System of Classification and Labeling of Chemicals. Changes include revised hazard classifications, updated label and safety data sheet requirements, special labeling provisions for small containers, and new rules governing chemical concentration information claimed as a trade secret. Employers may receive updated labels and safety data sheets from suppliers even when the products themselves have not changed.

For employers that use hazardous chemicals, the immediate task is to review updated supplier information and determine whether workplace practices need to change. By November 20, federally covered employers must, where necessary:

• Update alternative workplace labels, including labels used on secondary containers.

• Revise their written hazard communication programs to reflect updated hazard information.

• Train affected employees on newly identified physical, health, or other covered hazards and the measures needed to protect themselves.

Simply handing employees a safety data sheet does not satisfy the training requirement. Employees need an explanation of the hazards and how to use the information to work safely. The separate employer deadline for corresponding updates involving chemical mixtures is May 19, 2028. Existing hazard communication duties continue during the transition.

How does this affect California and other State Plan states?

The federal deadline applies directly to workplaces under federal OSHA jurisdiction. States operating OSHA-approved State Plans must maintain standards at least as effective as the federal requirements, but employers must check their state's adopted rules and compliance schedule. A federal revision does not automatically establish the same deadline under every state program.

California employers generally follow Cal/OSHA's Hazard Communication Standard in Title 8, section 5194. DIR's currently published regulation does not incorporate the federal November 20, 2026, deadline. California employers should continue complying with section 5194 and monitor state adoption of the federal revisions. They also have an existing duty to provide employees with new safety data sheet information within 30 days of receipt when it indicates significantly increased health risks or additional protective measures.

What employers should do now

Agricultural employers should use the approaching deadline to review chemical inventories, request current safety data sheets, check workplace labels, and determine whether employees need additional instruction. Businesses operating in multiple states should confirm the requirements for each location rather than assume one compliance schedule applies throughout their operations.