HazCom 2024 deadlines: what dental, veterinary and medical practices must do — and when

OSHA's revised Hazard Communication Standard (HCS 2024) took effect on July 19, 2024. It aligns the US rule with Revision 7 of the Globally Harmonized System (GHS) and phases in new obligations — first for chemical manufacturers, importers and distributors, then for the employers who use their products. Dental, veterinary and medical practices are in the second group.

The full timeline (after the January 2026 extension)

Most products a clinic stocks — disinfectants, etchants, sterilants, fixatives — are mixtures, so many updated SDSs will keep arriving through 2027. The practical consequence: your SDS library is not a one-time project this cycle. Expect new revisions from suppliers and plan to swap them in as they arrive.

What changed in HCS 2024

• Alignment with GHS Revision 7, including updated hazard classification criteria.
• Small-container labeling relief: containers of 100 mL or less may carry abbreviated labels when the full label appears on the immediate outer package; containers of 3 mL or less may show only the product identifier when a label would interfere with normal use.
• New provisions on concentration ranges when manufacturers claim a composition as a trade secret.

A practical checklist for practices

• Inventory every hazardous product in operatories, labs, sterilization, surgery and storage.
• Request current SDSs from suppliers for anything with a revision date before 2024, and file new revisions as they arrive.
• Re-label secondary containers (spray bottles, decanted disinfectants) with the product identifier and hazard information.
• Update your written hazard communication program: chemical list, labeling method, SDS access, training.
• Train staff on any newly identified hazards and document it.
• Keep SDSs readily accessible to employees on every shift — electronic access is allowed when it creates no barriers (1910.1200(g)(8)).