Every employer whose own employees may be exposed to a hazardous chemical must train those employees — period. Under 29 CFR 1910.1200(h), training duty follows the employment relationship, not the property line. The host employer's separate duty under 1910.1200(e)(2) is to give other employers' written programs, safety data sheets (SDSs), and labeling/precautionary information to those contractors so they can train and protect their own people. For construction, 29 CFR 1926.59 simply adopts 1910.1200 by reference, so the rules are identical on a jobsite. Staffing agencies and host employers share the duty for temporary workers, and OSHA will cite either or both.
Why multi-employer HazCom gets cited so often
Hazard Communication has sat at or near the top of OSHA's most-cited standards list for more than a decade, and 1910.1200(h)(1) — failure to train — along with 1910.1200(e)(1) — no written program — are the most common subparts cited. On a single-employer site, responsibility is obvious. On a jobsite with a general contractor, six subs, a staffing agency, and a vendor delivering sealant, the question "whose worker is that?" decides who gets the citation.
OSHA applies its multi-employer citation policy (CPL 02-00-124) here. An employer can be cited as the exposing, creating, controlling, or correcting employer. A general contractor who never touches a drum of epoxy can still be cited as a controlling employer if it failed to exercise reasonable care over conditions it had authority to fix — including a sub's missing SDSs or unlabeled secondary containers.
The three roles, side by side
| Duty | Host / Controlling Employer | Contractor or Subcontractor | Staffing / Temp Agency |
|---|---|---|---|
| Written HazCom program — 1910.1200(e)(1) | Required for its own employees; must include methods for informing other employers under (e)(2) | Required — each contractor maintains its own program covering chemicals it brings or encounters | Required — covers agency employees; may reference host program for site-specific chemicals |
| Provide SDSs to other employers — 1910.1200(e)(2)(i) | Yes. Must give access to SDSs for chemicals the contractor's workers may be exposed to | Must provide SDSs for chemicals it brings onto the site to the host and other affected employers | Must obtain SDSs from the host for chemicals at the placement |
| Explain labeling system and precautionary measures — 1910.1200(e)(2)(ii)–(iii) | Yes, including any in-house/workplace labeling system that differs from GHS shipped labels | Yes, for its own containers and processes | Relays host information; verifies it was provided |
| Train employees — 1910.1200(h) | Own employees only | Own employees — cannot delegate to the host without retaining responsibility | Generic/foundational training (GHS pictograms, labels, SDS format, rights) |
| Site-specific chemical training | Typically delivers it for temps and for contractors working with host chemicals | Delivers for its own chemicals and tasks | Verifies the host delivered it; documents the verification |
| Construction citation basis | 1926.59 (adopts 1910.1200) | 1926.59 | 1926.59 or 1910.1200 depending on the setting |
What 1910.1200(e)(2) actually requires of the host
The text is short and the obligations are concrete. The written program must describe the methods the employer will use to inform any employer with employees at the workplace of:
- (e)(2)(i) — The methods used to provide access to SDSs for each hazardous chemical the other employer's employees may be exposed to while working. "Access" means during each work shift, in the work area — a binder locked in a trailer nobody can enter at 2 a.m. does not qualify.
- (e)(2)(ii) — Any precautionary measures that need to be taken to protect employees during normal operating conditions and in foreseeable emergencies.
- (e)(2)(iii) — The labeling system used in the workplace, including any alternative workplace labeling permitted under 1910.1200(f)(6).
Note what is not in that list: training. The host is not legally required to train the contractor's employees. But it is required to hand over the information that makes the contractor's training meaningful — and in practice, hosts that control a process (a refinery turnaround, a hospital sterile processing department, a food plant) usually do deliver site-specific orientation because it is the only efficient way to cover foreseeable emergencies.
The contractor's reciprocal duty
Paragraph (e)(2) runs both ways. A painting sub that brings isocyanate-containing coatings onto a site must give the host and other affected employers access to those SDSs and explain the precautions. Contractors who treat HazCom as the GC's problem routinely get cited under 1926.59 for both the missing written program and untrained crews.
Temporary workers: the shared-duty rule
OSHA's Temporary Worker Initiative guidance is explicit: the staffing agency and the host employer are joint employers for safety purposes, and both have HazCom obligations. The workable division:
- Staffing agency: provides general awareness training — what GHS pictograms mean, the nine hazard classes, how to read the 16-section SDS format required by 1910.1200(g)(2), the right to information, and how to ask questions. It must also do enough due diligence to know what hazards the assignment involves.
- Host employer: provides site- and chemical-specific training before the worker begins the task — which chemicals are in the area, where SDSs live, the workplace labeling system, engineering controls, and required PPE.
- Both: keep records. If OSHA asks and neither party can produce proof, both can be cited. Put the split in the staffing contract in writing, but understand that a contract cannot transfer an OSHA duty — it only clarifies execution.
When training is required — and how often
1910.1200(h)(1) requires training at the time of initial assignment and whenever a new chemical hazard is introduced into the work area. There is no annual refresher mandate in the federal standard, though state plans, customers, and union agreements frequently impose one, and many employers run annual refreshers as a practical matter. Retraining is also triggered when the written program changes, when workplace labeling changes, or when observation shows employees have not retained the material.
Training must cover, at minimum, the requirements of the standard, operations where hazardous chemicals are present, the location of the written program and SDSs, methods to detect releases, physical and health hazards, protective measures, and the details of the labeling and SDS systems.
What online training can and cannot do
A well-built online course covers the generic half of 1910.1200(h)(3) cleanly — GHS pictograms, signal words, hazard and precautionary statements, SDS sections, and employee rights. Our Hazard Communication (GHS) course is designed for exactly that portion, and it works well as the staffing agency's or contractor's baseline. It does not, by itself, satisfy 1910.1200(h). You must add site-specific instruction on the actual chemicals present, where SDSs are kept, your labeling system, and your emergency procedures, and document that it happened. If respirators are part of your controls, that triggers separate obligations under 1910.134 including medical evaluation and fit testing — see Respiratory Protection for the classroom portion of that program.
A practical checklist for the GC or host
- Collect each subcontractor's written HazCom program and chemical inventory before mobilization.
- Maintain a consolidated site SDS index accessible on every shift, electronically or on paper, with a backup for power/network loss.
- Issue a written (e)(2) notice at orientation covering SDS access, precautions, foreseeable emergencies, and your labeling system. Have attendees sign.
- Require subs to notify you before bringing any new chemical on site, and update the index same-day.
- Spot-check secondary containers for labels — 1910.1200(f)(6) is a frequent, easily avoided citation.
- For temps, confirm in writing which party delivered which half of the training, and keep both records.
- Coordinate with adjacent hazard programs; chemical work near energized equipment or isolated systems also implicates Lockout/Tagout (LOTO) procedures.
Frequently asked questions
Can a general contractor just train everyone on site and be done?
No. The GC can deliver excellent site-wide orientation, and that helps, but each subcontractor remains legally responsible under 1910.1200(h) for its own employees' training — including hazards specific to that sub's own chemicals and tasks. The GC's training does not transfer the duty, though it is strong evidence of reasonable care if the GC is cited as a controlling employer.
Is 1926.59 different from 1910.1200?
Substantively, no. 29 CFR 1926.59 states that the requirements of 1910.1200 apply to construction work. OSHA cites construction employers under 1926.59, but the obligations — written program, labels, SDSs, training, multi-employer information sharing — are identical.
Does HazCom training expire after one year?
Federal OSHA sets no expiration date. The triggers are initial assignment and introduction of a new chemical hazard. Many employers, state plans, and client contracts require annual refreshers, so check your specific obligations rather than assuming the federal minimum applies.
Who is responsible if a temp worker is injured by a chemical nobody told them about?
Both the staffing agency and the host employer can be cited. The host typically bears the site-specific training failure; the agency can be cited for failing to verify that the host provided it, or for placing a worker into a known hazard without basic HazCom instruction.
Get the baseline handled
Generic GHS training is the one piece you can standardize, document, and deploy across a whole crew in an afternoon. FastCredentials delivers it online with instant certificates you can file in your HazCom records — then layer your site-specific walkthrough on top and you have a defensible program.