Hazard Communication updates for substances are due November 20, 2026

October 7, 2026

Employers covered by federal OSHA's Hazard Communication Standard have until November 20, 2026 to make necessary substance-related updates to workplace labeling, their hazard communication program and employee training for newly identified hazards. The requirement appears in 29 CFR 1910.1200(j)(2)(ii).

OSHA extended four compliance dates in a final amendment effective January 15, 2026. The extension preserves separate schedules for substances and mixtures, and for chemical suppliers and employers. APT's record of the Hazard Communication deadline extension collects the dates and source evidence.

The revised schedule

The January amendment moved each date forward by four months:

May 19, 2026: manufacturers, importers and distributors evaluating substances must comply with the modified provisions.
November 20, 2026: employers must make necessary substance-related workplace label, program and additional hazard-training updates.
November 19, 2027: manufacturers, importers and distributors evaluating mixtures must comply with the modified provisions.
May 19, 2028: employers must make the corresponding necessary mixture-related updates.

The substance supplier date has passed. The next employer milestone concerns substances; mixtures retain their later schedule. The amended regulatory text sets out these obligations.

Applying the transition at a workplace

The underlying 2024 Hazard Communication update took effect July 19, 2024 and principally aligned the standard with GHS Revision 7. OSHA's January 2026 amendment changes the compliance timetable.

During the applicable transition period, suppliers and employers may comply with the previous standard, the revised standard, or both. Existing hazard communication duties continue during that period.

These dates describe the federal OSHA schedule. Employers in an OSHA-approved State Plan jurisdiction should also check the applicable state requirements. OSHA's standards guidance notes that state standards or policies can differ.

Reviewing the substance inventory

APT's practical interpretation is that EHS teams should identify the substances in their inventory that need revised hazard information and compare incoming supplier safety data sheets with the workplace's current documents. That review can establish which alternative workplace labels need changes and what additional training is necessary.

Assigning an owner to each required update and recording the document version used will help teams complete the applicable work before November 20. The inventory review should distinguish substances from mixtures so their separate dates remain visible.

APT's industrial hygiene regulatory tracker covers selected workplace exposure and regulatory developments.