A job hazard analysis (JHA) is a technique that breaks a job into individual tasks, identifies the hazards associated with each task, and establishes controls to prevent injuries before they happen. It examines the relationship between four elements: the worker, the task, the tools, and the work environment. You may also see it called a job safety analysis (JSA), but the two terms are interchangeable and produce the same result.
Whether you’re a safety manager building a program from scratch or an employee trying to understand why your supervisor handed you a JHA worksheet, here’s how the process works and why it matters.
Why a JHA Matters
Workplace injuries most often happen when hazards go unrecognized or when workers don’t have clear, safe procedures to follow. A JHA forces you to slow down and think through every step of a job before anyone performs it, catching risks that experience or routine might cause people to overlook. It’s especially valuable when a new process, piece of equipment, or chemical is introduced, because those are exactly the moments when assumptions get people hurt.
Beyond prevention, a completed JHA serves as a training document. New employees can review it to understand not just what to do, but why each step matters and what could go wrong if shortcuts are taken.
The Six Steps of a JHA
The U.S. Department of Labor outlines a straightforward six-step process.
1. Select and Prioritize Jobs
Not every task needs a JHA on day one. Start with jobs where a potential injury or illness could be severe, or jobs that frequently result in injuries or near misses. Review your incident records, talk to workers, and focus on the highest-risk tasks first. Jobs that are new to your operation, complex enough to require written instructions, or that have recently changed in process or procedure should also move to the top of the list.
2. Break the Job Into Steps
Detail every aspect of how the job is actually performed, not how it’s supposed to be performed in theory. Watch workers do the task. Take photos or video if it helps. The goal is to capture each discrete step so nothing gets missed in the analysis. If a step gets skipped here, the hazard hiding in it won’t show up later.
3. Identify Hazards in Each Step
Go through each step and ask: what could go wrong? Hazards generally fall into a few categories:
- Machine-related: moving parts, pinch points, entanglement risks
- Physical: falls, struck-by objects, noise, extreme temperatures
- Chemical: exposure to toxic substances, flammable materials, corrosives
- Biological: bloodborne pathogens, mold, animal contact
- Ergonomic: repetitive motion, awkward postures, heavy lifting
Review previous injury and illness records for that job. Consider worst-case scenarios, not just the most likely ones.
4. Describe the Hazards in Detail
For each hazard, dig deeper. Who does it affect? What causes it? When is it most likely to occur? Where exactly in the workspace does the risk exist? Are there contributing factors like poor lighting, wet floors, or fatigue from long shifts? This step turns a vague concern (“someone could get hurt”) into a specific, actionable description (“the operator’s hands are within six inches of the blade when feeding material”).
5. Select Controls
Once you’ve described a hazard clearly, determine the most effective way to control it. Controls follow a ranked system called the hierarchy of controls, which moves from most effective to least effective:
- Elimination: remove the hazard entirely, such as discontinuing a dangerous process
- Substitution: swap a hazardous material or method for a safer one
- Engineering controls: physically prevent the hazard from reaching workers, like installing machine guards or ventilation systems
- Administrative controls: change how work is done through procedures, training, signage, or job rotation
- Personal protective equipment (PPE): gloves, goggles, respirators, and other gear that protects the individual worker
PPE sits at the bottom of this list for a reason. It doesn’t remove or reduce the hazard itself; it only puts a barrier between the hazard and the worker. Whenever possible, aim for controls higher on the list. A machine guard that makes it physically impossible to reach a blade is more reliable than a policy telling someone to keep their hands clear.
6. Review the JHA
A JHA isn’t a one-time document. Review it periodically, and revisit it immediately if an injury or illness occurs on that job. Changes in equipment, materials, work environment, or personnel all warrant an update. If a step in the job changes, the hazards associated with it may change too.
What a JHA Looks Like in Practice
Most JHAs take the form of a simple three-column worksheet. The left column lists each step of the job in order. The middle column describes the hazards associated with that step. The right column specifies the control measures for each hazard. This format makes it easy for workers to scan the document before starting a task and for supervisors to verify that controls are in place.
For example, a JHA for operating a table saw might break the job into steps like “inspect blade,” “adjust fence,” “feed material,” and “clear offcuts.” The hazard column for “feed material” might note laceration risk from blade contact and kickback risk from binding. The control column would then list the blade guard, anti-kickback pawls, push sticks, and eye protection required for that step.
Who Should Be Involved
The workers who actually perform the job are your best resource. They know where the awkward moments are, what workarounds they’ve developed, and which steps feel the riskiest. Involving them in the analysis also increases the chance they’ll follow the controls, because they helped design them rather than having safety procedures handed down from someone who’s never done the work.
Supervisors and safety personnel bring a different perspective. They can connect patterns across multiple jobs, reference incident history, and ensure controls meet regulatory expectations. The strongest JHAs come from combining both viewpoints.
When to Create or Update a JHA
Certain situations should trigger a new or revised JHA:
- A new job or task is introduced
- An existing job changes in process, equipment, or materials
- An injury, illness, or near miss occurs on the job
- A job is complex enough to require written instructions
- Workers report concerns about a specific task
Even without a triggering event, reviewing your JHAs on a regular schedule keeps them accurate. Work environments drift over time. Equipment wears. People develop habits that bypass safeguards. A periodic review catches that drift before it turns into an incident.