OSHA HazCom 2024: The Employer Deadline for Substances Is November 20, 2026

If your crews or production staff work with hazardous chemicals, there is a federal OSHA date to put on the calendar. By November 20, 2026, employers must make any needed updates to workplace labels, their hazard communication program, and employee training for substances under OSHA's 2024 update to the Hazard Communication Standard (HCS), 29 CFR 1910.1200.

That date is less than a month away. Here is what the rule actually requires, what it does not, and a short checklist to get it done.

Quick background

OSHA published its update to the HCS on May 20, 2024 (89 FR 44144). It took effect July 19, 2024. The update aligns the standard primarily with Revision 7 of the United Nations Globally Harmonized System (GHS). It adds and revises hazard classes and categories, updates label elements and precautionary statements, and revises several Safety Data Sheet (SDS) sections.

On January 15, 2026, OSHA published a final rule (91 FR 1695) that pushed every compliance date back by four months. OSHA said it needed the extra time to publish guidance before the revised provisions took effect. The rule was effective the day it was published. We checked the Federal Register on October 22, 2026, and found no later OSHA document that changes these dates.

The compliance dates, as extended

• May 19, 2026: Chemical manufacturers, importers, and distributors evaluating substances must comply with all modified provisions. This date has passed.
• November 20, 2026: All employers, for substances, must update workplace labeling, the hazard communication program, and training as necessary.
• November 19, 2027: Chemical manufacturers, importers, and distributors evaluating mixtures must comply.
• May 19, 2028: All employers, for mixtures, must make the same workplace updates.

Until the date that applies to you, OSHA lets you comply with the previous (2012) version of the standard, the 2024 version, or both.

What employers must do by November 20

The regulatory text in 1910.1200(j)(2)(ii) is narrower than many people expect. For substances, all employers must, as necessary:

• Update any alternative workplace labeling used under paragraph (f)(6). These are the workplace labels you apply yourself, such as on secondary containers, rather than the shipped labels your supplier provides.
• Update the hazard communication program.
• Provide any additional employee training, under paragraph (h)(3), for newly identified physical hazards, health hazards, or other hazards covered by the standard.

The key words are "as necessary." OSHA is not asking employers to rebuild their programs from scratch. It is asking you to catch the changes. If an updated SDS or label from your supplier shows a hazard that your workplace labels, written program, or training do not cover yet, that gap needs to be closed by November 20.

Manufacturers and importers had to update labels and SDSs for substances by May 19, 2026. That makes now a good time to look at what has come in since then and compare it to what you have on file.

Substances versus mixtures

The November 20 date covers substances, meaning single chemicals (an element or compound, including any stabilizing additives and process impurities). If a product is a mixture, the employer date is May 19, 2028, and the supplier date is November 19, 2027. When you sort your chemical inventory, it helps to tag each item as a substance or a mixture so you know which date applies. Section 3 of the SDS (composition and information on ingredients) shows which one a product is.

A practical checklist

1. Pull your current chemical inventory. Your written program must include a list of the hazardous chemicals known to be present, using a product identifier that matches the SDS.
2. Flag the substances on that list and confirm you have the most current SDS for each one. Suppliers could start using the 2024 version as early as May 2024, so read Section 2 (hazard identification) of every current SDS, not just recent revisions, for any new or changed hazard classifications.
3. Compare those hazards to your secondary container labels. If you use in-house labels under (f)(6), make sure they still give at least general information about the hazards, along with the product identifier.
4. Update the written program where needed. Check the chemical list, the section on non-routine tasks, and, for construction and other multi-employer sites, how you share hazard information and SDS access with other employers on site.
5. Train for anything new. Training is required at initial assignment and whenever a new chemical hazard is introduced. If a substance now carries a newly identified hazard, the employees exposed to it need training on that hazard. It is also a good time to refresh how to read the updated label and SDS.
6. Document it. Keep a record of what you reviewed, what changed, and who was trained, so you can show the work if OSHA asks.
7. Check your state. If your workplace is covered by an OSHA-approved State Plan, the state must adopt provisions at least as effective as the federal rule, but its timing and text may differ. Confirm what your state has adopted before you rely on the federal dates.

Do not forget the 2028 date

Once November 20 passes, the next employer milestone is May 19, 2028, for mixtures. Building a simple habit now, such as reviewing every new or revised SDS when it arrives, will make that second round much easier. For more on keeping your SDS library current, see our guide to SDS management compliance: https://www.provisioehs.com/blog/sds-management-compliance

Need help before the deadline?

Provisio EHS can review your chemical inventory, written hazard communication program, and training records against the 2024 update and help you close gaps before November 20. Call us at 385-316-2837 to set up a review.

This post summarizes federal OSHA requirements and is not legal advice.

Sources

All retrieved Oct. 22, 2026.

• Federal Register, Hazard Communication Standard final rule extending compliance dates, 91 FR 1695, Jan. 15, 2026
• OSHA, 29 CFR 1910.1200 Hazard Communication
• OSHA, Hazard Communication rulemaking
• OSHA, HCS 2024 compliance date extension
• OSHA, Questions and Answers for the 2024 Update to the HCS
• OSHA, Hazard Communication