Revised Hazard Communication Standard Deadline Approaching

Employers have less than two months to meet the next compliance milestone under OSHA’s updated Hazard Communication Standard.

By Nov. 20, 2026, every employer that uses hazardous chemicals must have updated workplace labels, written HazCom program, and employee training to reflect newly identified substance hazards.

The stakes are considerable: HazCom ranked as the second-most frequently cited OSHA standard in fiscal year 2025.

Organizations that have not yet begun preparing should do so immediately. 

What Changed, Why It Matters Now 

OSHA’s May 2024 final rule materially updated the HazCom standard (29 CFR § 1910.1200), realigning it with Revision Seven of the United Nations Globally Harmonized System of Classification and Labelling of Chemicals, GHS Rev. 7.

Although the overall HazCom framework remains intact, these latest revisions are substantive.

The rule updated classification criteria for skin and eye hazards, added desensitized explosives as a new hazard class, revised criteria for flammable gases and aerosols and introduced small-container labeling provisions.

Hazard classifications must now account for reasonably anticipated downstream uses of a chemical, not just intended uses.

Notably, hazard classifications must now account for reasonably anticipated downstream uses of a chemical, not just intended uses.

The rule also revised trade secret provisions, permitting certain concentration data to be withheld as confidential business information where specified regulatory conditions are met.  

The upstream obligation already took effect: chemical manufacturers, importers and distributors were required to complete their substance evaluations by May 19, 2026 (in contrast, mixture evaluations are due in Nov. 2027).

Attention now turns to the obligations that fall on all employers: 

• Nov. 20, 2026: Employers must update alternative workplace labels, written HazCom programs and employee training for substances reflecting newly identified hazards.  
• May 19, 2028: Employers must complete the corresponding labeling, program and training updates for mixtures.  

Employers must be in compliance before these deadlines or risk violations and penalties.   

Enforcement Risk Is Elevated 

As noted above, OSHA’s preliminary 2025 Top 10 Most Cited Standards list placed HazCom at number two, behind only fall protection, with over 2,500 total violations recorded.

Serious violations carry penalties of up to $16,550 each; willful or repeated violations can reach $165,514 per citation.

For employers managing large chemical inventories, a single inspection can produce multiple citations, compounding both the financial exposure and the reputational risk. 

What Employers Should Do Now 

1. Confirm receipt of updated SDSs. Manufacturers and importers were required to revise substance SDSs by May 19, 2026. Verify that your suppliers have delivered them and flag any newly classified hazards. Otherwise, request up-to-date SDSs.   
2. Revise workplace labels. Update any alternative workplace labeling to reflect current hazard classifications, signal words, pictograms and precautionary statements.  
3. Refresh your written HazCom program. Incorporate changes in hazard classifications and labeling protocols so the program accurately describes your current practices. 
4. Complete employee training. Workers must be trained on newly identified hazards, updated label elements and revised SDS formats before Nov. 20, 2026.  
5. Look ahead to mixtures. Maintain a separate compliance timeline for mixtures, with deadlines in November 2027 and May 2028. Beginning that review now will ease the transition.  
6. Check state plan requirements. Employers operating in jurisdictions with OSHA-approved state plans should verify that their state agencies have adopted the revised deadlines, as state timelines may differ from the federal schedule. 

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