If your hospital stocks concentrated disinfectants, formalin or chemotherapy agents, OSHA's Hazard Communication Standard applies to you.
It requires a written hazard communication program at each workplace, a list of the hazardous chemicals you keep, safety data sheets your team can reach on any shift, labels on chemical containers, and training when someone is first assigned to work around chemicals.
Here is what that looks like in a veterinary practice, and when the 2024 update deadlines land.
Rules vary by state and change
This guide explains federal rules and the state rules it names, as of the date above.
Employment law and veterinary practice rules differ by state and are revised often, so confirm current requirements with your state veterinary board, labor agency or employment counsel before you act on them.
It is general information, not legal advice.
Which chemicals in a vet hospital trigger HazCom
HazCom follows the chemicals, not the profession.
Walk your hospital from reception back to the runs and the products a HazCom review has to judge pile up quickly: concentrated disinfectants mixed for kennels and tables, formalin in the biopsy jars, anesthetic agents, and the chemotherapy drugs handled in oncology appointments.
The standard's own unit of work is the list of hazardous chemicals present at your workplace, and a small-animal hospital generates a real one.
Two carve-outs matter in a practice.
Drugs in solid, final form for direct administration to the patient — tablets and pills — are excluded from HazCom, and so are over-the-counter retail drugs and drugs an employee brings in for their own personal use.
The finished tablet or chew handed to a patient is the shape of that exemption.
A second carve-out covers consumer products — the kind of item a team member might buy at a hardware store — but only where you use the product the way the manufacturer intended and the exposure, in both duration and frequency, is no greater than what a consumer would experience.
Practice life strains that test: a cleaner used once on the break-room counter can fit it, while a disinfectant concentrate mixed and applied all day, every day, in a kennel bank does not read as a consumer exposure pattern.
Where the use is not clearly consumer-grade, treat the product as covered and keep it on your list.
Formalin carries a second, stricter layer on top of HazCom: OSHA's formaldehyde standard.
It sets a permissible exposure limit of 0.75 ppm averaged over eight hours and a short-term exposure limit of 2 ppm over 15 minutes.
Employees exposed at or above the 0.5 ppm action level — again as an eight-hour average — or above the short-term limit must be offered medical surveillance.
If formalin jars are opened on your surgery pack table or at the histopathology bench, that standard is part of your compliance picture alongside HazCom.
This page stays on the chemical shelf.
Radiation is its own subject — the practice manager's guide to radiation and OSHA safety covers that side of the hospital.
Written program, inventory and SDS access
The spine of HazCom is a written program.
The standard requires employers to develop, implement and maintain — at each workplace — a written hazard communication program covering labels, safety data sheets and training, together with a list of the hazardous chemicals present.
That "each workplace" phrasing matters if you run two locations: each site needs a program reflecting the chemicals that site actually uses.
The chemical inventory is the document everything else hangs off.
Build it by walking the hospital — treatment, surgery, kennels, the lab, the pharmacy shelf — and listing every hazardous product, not just the alarming ones: the concentrate mixed nightly, the formalin, the injectables.
The safety data sheets you collect, the containers you keep labeled and the chemicals you train on all key off that list.
For each hazardous chemical you must keep a safety data sheet that is readily accessible to employees during each work shift.
Electronic access is allowed, but only if it creates no barriers to immediate access — a PDF on a shared drive that staff cannot open from the treatment area, or that sits behind a login only the office manager holds, is not immediate access.
Whatever system you choose, test it the way an employee would use it: mid-shift, gloved, in the treatment room, needing to know what they just splashed.
Labels and secondary containers
Products arriving at your door come labeled by the supplier, and under the updated HazCom timeline the manufacturers, importers and distributors refresh those shipped-in labels and safety data sheets on their own schedule.
Your job is keeping labels honest on everything after that point — above all on the containers you fill yourself.
The standard draws a narrow line here.
A portable container you fill from a labeled one for your own immediate use — the cup of disinfectant mixed and used up on the spot — does not need a label.
The moment that same spray bottle is kept for later, or left where whoever is on shift might grab it, the exemption is gone and it needs a label.
In a hospital with shared shifts, the habit to build is simple: anything that outlives the task, or outlives your own hands on it, gets labeled with what is actually in it.
One more labeling exception fits pharmacy workflow: drugs dispensed by a pharmacy to a health care provider for direct administration to a patient are exempt from labeling.
That covers dispensing for direct administration — it is not license for mystery containers around the hospital, and it does not extend to decanting a stock bottle into an unlabeled squirt bottle for the week.
Training new hires before exposure
Training has two triggers in the standard, and both are about timing.
Employees must be trained on the hazardous chemicals in their work area at the time of initial assignment, and again whenever a new chemical hazard they have not previously been trained about is introduced into their work area.
The second trigger is a living one: switching disinfectant lines, adding a chemotherapy protocol or bringing in a new lab chemical restarts the training clock for everyone whose work area it touches.
Sequence it into hiring rather than leaving it to the first slow afternoon.
A new kennel attendant, veterinary assistant or associate veterinarian is "initially assigned" the moment they start working around your chemical list, so HazCom belongs in onboarding — the same slot as keys, passwords and the tour.
Tailor it to the role's work area: kennel staff need the disinfectant conversation at the front end, while technicians and doctors also need formalin and hazardous drugs in theirs.
Formalin carries its own training rule on top.
Employees exposed to formaldehyde at or above 0.1 ppm must be trained at initial assignment and at least annually, and you may skip that cycle only with objective data showing exposure below 0.1 ppm.
If you cannot produce that data for the surgery pack table and the biopsy bench, put the formaldehyde refresher on the calendar every year.
Keep a record of who was trained, on which chemicals, and when.
A dated sign-off per person per chemical is the file that answers "who was told what, and when" without anyone reconstructing it from memory.
2024 HazCom update deadlines
OSHA updated the Hazard Communication Standard effective July 19, 2024, then pushed the compliance dates back by four months in a final rule published January 15, 2026 (91 FR 1695).
The dates that matter to a veterinary practice now are these:
| Who | Substances | Mixtures |
|---|---|---|
| Manufacturers, importers and distributors — your suppliers | May 19, 2026 | November 19, 2027 |
| Employers — your practice | November 20, 2026 | May 19, 2028 |
The employer rows are your working deadlines.
No later than November 20, 2026 for substances and May 19, 2028 for mixtures, you must update alternative workplace labels, the written HazCom program and employee training for newly identified physical, health and other hazards the update covers.
In practice this runs off your suppliers: as updated safety data sheets and labels arrive, swap them into the file, note the change in the program, and retrain anyone affected if the hazard information changed.
The transition period has a built-in flexibility: until your applicable compliance date, you may comply with either the updated standard or the version in effect as of July 1, 2023 — or both at once.
A file that mixes old-format and new-format safety data sheets while suppliers phase in is the situation that permission fits.
What it does not do is move the employer deadlines: labels, the program and training still need to be current by the dates in the table.
Hazardous drugs (chemo) and NIOSH lists
Chemotherapy is where HazCom gets specific about veterinary medicine.
OSHA applies the standard to drugs in the non-manufacturing sector: hazardous drugs — other than tablets and pills in solid, final form for direct administration to the patient — must be included on your list of hazardous chemicals, and staff who handle them must receive information and training.
The finished tablet is the exemption; anything you draw up, mix or otherwise handle in a non-final form is not.
For working out which drugs count as hazardous, the reference to check is the NIOSH List of Hazardous Drugs in Healthcare Settings.
The 2024 edition (NIOSH Publication 2025-103, published December 2024) superseded the 2016 list, adding 25 drugs and removing 7.
It is a human-health list and NIOSH guidance rather than an OSHA standard, and many of the chemotherapy agents used in veterinary oncology appear on it — so pull the current list and check it against the agents your hospital actually stocks, rather than assuming your shelf matches either edition.
Handling hazardous drugs also changes the conversation when a team member is pregnant.
What to adjust, when, and how to do it lawfully is its own topic — our guide to pregnant employees covers radiation, anesthetic gases and the rest of that picture.
HazCom's contribution to that conversation is simpler: the chemical list and the training records are the paper that shows who was told what, and when.
HazCom also connects to the rest of how you run the hospital: the same onboarding that carries the chemical training carries the rest of a new hire's setup.
The veterinary hiring hub collects the site's hiring guides.
Build the program in one pass
- Walk every room and list each hazardous chemical on one inventory — such as disinfectants, formalin, anesthetic agents, lab chemicals and hazardous drugs
- Collect a safety data sheet for every product on the list, and test that staff can open it mid-shift from where they actually work
- Label every secondary container that is kept for later or shared between shifts, not only the one in active use
- Add hazardous drugs other than finished tablets and pills to the chemical list, and train everyone who handles them
- Train each new hire on their work area's chemicals at initial assignment, and retrain whenever a new chemical hazard is introduced
- Put the formaldehyde refresher on an annual cycle unless you have objective data showing exposure below 0.1 ppm
- Calendar November 20, 2026 (substances) and May 19, 2028 (mixtures) to update labels, the written program and training
- Swap in supplier safety data sheets and labels as they arrive, and note each change in the written program