17.2 Communicating Hazards and Controls to the Workforce
Key Takeaways
OSHA requires training to be presented in a language and vocabulary the workers can understand, so delivering a required program in English to a crew that is not fluent does not satisfy the standard.
ANSI Z535 assigns signal words by severity: DANGER for a hazardous situation that will result in death or serious injury, WARNING for one that could, and CAUTION for one that could result in minor or moderate injury.
29 CFR 1910.145 governs accident prevention signs and tags, using red for danger, yellow for caution, and orange for warning of dangerous machine parts.
Hazard communication under 29 CFR 1910.1200 requires labels, safety data sheets, a written program, and training, and the label and the SDS must use the same product identifier so a worker can move between them.
Risk communication is most effective when it states what is known, what is not known, what is being done, and what the listener should do, because omitting uncertainty destroys credibility when it later emerges.
17.2 Communicating Hazards and Controls to the Workforce
A control that nobody knows about does not exist. The BCSP blueprint lists methods to communicate hazards and controls to the workforce as a knowledge area in its own right, and it belongs in the Business Case of Safety domain rather than in a technical domain for a reason: communication is where technical work either becomes operational reality or does not.
The recurring professional failure is assuming that transmission equals communication. The safety data sheet is on the shared drive, the sign is on the door, the policy was emailed. None of that establishes that a worker knows what will hurt them and what to do about it.
The Legal Communication Obligations
Hazard communication, 29 CFR 1910.1200. The standard requires four integrated elements:
- Labels on shipped containers bearing the product identifier, signal word, hazard statements, pictograms, precautionary statements, and supplier information. Workplace containers must be labelled with the product identifier and words, pictures, or symbols conveying the hazards.
- Safety data sheets in the standardized 16-section format, readily accessible to employees in their work areas during each work shift.
- A written hazard communication program describing how labels, SDSs, and training will be met, including the list of hazardous chemicals present.
- Training at initial assignment and whenever a new physical or health hazard employees have not previously been trained about is introduced into the work area.
The label and the SDS must share the same product identifier, which is what allows a worker holding a container to find the right SDS. Programs frequently break here, when a facility relabels decanted material with an internal nickname.
Signs and tags, 29 CFR 1910.145. OSHA specifies accident prevention signs and tags: danger signs in red, black and white for immediate hazards; caution signs in yellow for potential hazards or unsafe practices; safety instruction signs; and orange to designate dangerous parts of machines or energized equipment that may cut, crush, shock, or otherwise injure.
ANSI Z535 is the consensus system that modern signage follows, and its signal word hierarchy is examinable:
| Signal word | Color | Meaning |
|---|---|---|
| DANGER | Red | Hazardous situation which, if not avoided, will result in death or serious injury; reserved for the most extreme situations |
| WARNING | Orange | Hazardous situation which, if not avoided, could result in death or serious injury |
| CAUTION | Yellow | Hazardous situation which, if not avoided, could result in minor or moderate injury |
| NOTICE | Blue | Information not related to personal injury, such as property damage or a practice requirement |
| SAFETY INSTRUCTIONS | Green | Safety-related instructions, location of safety equipment |
The most common signage error in industry is signal word inflation: DANGER placards applied everywhere, which trains workers to disregard the word that should stop them.
Language, Literacy, and Comprehension
OSHA's position is settled: training must be presented in a language and vocabulary the workers can understand. Delivering a required program in English to a crew that is not fluent in English does not satisfy the standard, and a signed attendance sheet from such a session is evidence of a violation rather than a defence against one.
Practical implications:
- Determine the actual languages and literacy levels of the workforce rather than assuming.
- Use qualified translation for written material; a bilingual worker pressed into ad hoc interpretation is not a control, and it places that worker in an unfair position.
- Reduce reading level for written procedures and signs. Short sentences, one instruction per line, concrete verbs.
- Use pictograms and photographs of the actual equipment, which cross language barriers and are more specific than generic clip art.
- Verify comprehension by demonstration or teach-back rather than by asking whether people understood.
Designing Multi-Channel Communication
No single channel reaches everyone. A functioning system layers them and matches the channel to the urgency and permanence of the message.
| Channel | Best for | Weakness |
|---|---|---|
| Pre-job brief / toolbox talk | Task-specific hazards, immediate application | Transient; depends on the supervisor |
| Signs, labels, tags, floor marking | Persistent hazards at the point of exposure | Ignored when over-used or inflated |
| Visual management (shadow boards, colour coding, status indicators) | Making the correct state obvious at a glance | Requires discipline to maintain |
| Safety alerts / lessons learned bulletins | Propagating a specific finding across sites | Becomes wallpaper if issued too often |
| Digital: apps, screens, email, intranet | Speed, reach, documentation | Excludes workers without devices or access |
| Alarms and public address | Immediate emergency action | Only works if the meaning was trained beforehand |
| Peer-to-peer and safety committee channels | Credibility, two-way flow | Slower, informal |
Safety alerts deserve specific discipline. An alert that will be read has a single clear finding, states what happened in plain language, states the specific action required and by whom, and is short enough to be read at a workface. An alert that recites a narrative and concludes "be vigilant" has requested nothing and will change nothing.
Risk Communication Principles
When the message concerns uncertainty or bad news — an exposure result, a suspected contamination, a serious incident — a different discipline applies:
- Lead with what the listener needs to do. Action first, background second.
- State what is known, what is not known, and when you will know more. Concealing uncertainty is the fastest route to lost credibility, because the unknown always surfaces later and the concealment then contaminates everything else you have said.
- Do not minimize. "There is no cause for concern" told to people who are concerned reads as dismissal.
- Acknowledge the legitimacy of the concern even when the technical risk is low.
- Avoid jargon and unexplained numbers. "Below the PEL" means nothing to most audiences; "below the legal limit, and here is what that limit is set to protect against" means something.
- Use a consistent, named messenger. Credibility attaches to people, not to bulletins.
- Say what you are doing about it, with a date.
Verification
Communication is verified by observing behaviour and by asking, not by counting transmissions:
- Walk the floor and ask workers what the hazards of their task are and where the controls are.
- Check whether workplace container labels actually match SDS product identifiers.
- Check whether signage is current — signs referring to removed equipment teach workers that signs are unreliable.
- Track whether safety alerts produce the specific action requested.
Senior manager pitfall. Measuring communication by volume — number of alerts issued, emails sent, signs installed. Each of those, past a threshold, reduces the attention paid to all the others. The scarce resource is workforce attention, and every low-value message spends some of it.
A food processing plant employs a production workforce in which roughly 60 percent of employees are more comfortable in Spanish than English. The employer delivers its required hazard communication training in English, distributes English-language safety data sheets, and retains signed attendance sheets. During an inspection, several employees cannot describe the hazards of the sanitizing chemicals they handle daily. How should this be characterised?
The employer is compliant, because 29 CFR 1910.1200 specifies the required training content but does not prescribe the language of delivery, and signed attendance sheets document that training occurred.
The employer is compliant with respect to training but not with respect to safety data sheets, which must be provided in every language spoken by the workforce under the standard.
The employer is non-compliant. OSHA requires training to be presented in a language and vocabulary the workers can understand, so the attendance sheets document a session that did not meet the standard rather than establishing compliance.
The employer is compliant provided a bilingual employee was present during the session and available to interpret informally for colleagues who requested it.
A safety manager reviewing site signage finds DANGER placards on the electrical room door, on every ladder, on the chemical storage cabinet, on the forklift charging area, on the compactor, and on the break room refrigerator warning against storing laboratory samples. Applying ANSI Z535, what is the principal problem and its consequence?
The signs should all be reclassified as NOTICE signs, because ANSI Z535 reserves DANGER, WARNING, and CAUTION exclusively for signage on machinery rather than on rooms, doors, or storage areas.
The problem is signal word inflation. ANSI Z535 reserves DANGER for a hazardous situation which, if not avoided, will result in death or serious injury; applying it indiscriminately trains workers to disregard the one word that should stop them.
The problem is that OSHA 29 CFR 1910.145 prohibits the use of ANSI Z535 signal words in general industry, requiring instead the exclusive use of the red, yellow, and orange colour scheme without text.
There is no problem, because using the highest severity signal word consistently across a site ensures that no hazard is ever understated and eliminates the risk of a worker misjudging severity.
Following a serious near miss in which a contractor's excavator struck an unmarked buried electrical duct bank, a corporate safety team drafts a four-page safety alert narrating the sequence of events, quoting the applicable standards, and concluding with the instruction to "remain vigilant when performing excavation activities." What is the principal weakness of this alert?
The alert is too short to convey the technical complexity of underground utility strikes and should be expanded to include the full incident investigation report and root cause analysis.
The alert should not have been issued until the incident investigation was formally closed and legal review completed, because premature circulation creates discoverable admissions.
The alert requests no specific action. An effective alert states one clear finding in plain language and specifies exactly what must be done differently, by whom, and by when; "remain vigilant" cannot be performed, verified, or audited.
The alert is weakened by quoting applicable standards, which should be omitted from workforce communications because regulatory citations reduce comprehension among non-technical readers.
Air monitoring in a maintenance shop detects a solvent at 60 percent of the permissible exposure limit. Rumours spread that workers are being poisoned. The plant manager proposes issuing a notice stating that results are below the legal limit and there is no cause for concern. Applying risk communication principles, what is the better approach?
Issue no communication, since results below the permissible exposure limit create no notification obligation and a bulletin would legitimise an unfounded rumour.
Issue the proposed notice but attach the full laboratory report and sampling methodology, so that technically qualified employees can verify the conclusion independently.
Delegate the communication to the human resources department, since the issue presented is workforce morale rather than an industrial hygiene matter.
State what the result was and what the limit protects against in plain language, acknowledge that the concern is legitimate, say what is not yet known and when more will be known, describe the actions being taken to reduce exposure further, and have a consistent named messenger deliver it.
Sections you finish are checked off in the contents.