What Is JHA
A Job Hazard Analysis (JHA) is a systematic procedure that breaks down a specific work task into individual steps and identifies the hazards present at each step, then determines appropriate controls to eliminate or reduce those hazards. Unlike general safety policies, a JHA is task-specific and granular. For example, a JHA for "cleaning a commercial oven" would examine hazards from heat exposure, chemical fumes, electrical components, and awkward postures as separate steps rather than treating the entire task as one risk category.
OSHA does not mandate a specific JHA format, but the agency frequently cites incomplete hazard analysis as a contributing factor in workplace accidents. Safety managers who conduct JHAs systematically reduce incident rates by 20 to 40 percent according to industry safety benchmarks. The analysis works for both industrial settings and home maintenance tasks like attic insulation installation or pressure washing.
When You Need a JHA
Conduct a JHA before starting any task that involves:
- Chemical exposure (cleaning agents, pesticides, paint thinners)
- Heat sources or fire risk (welding, cooking on open flame, hot work permits)
- Heights or falling objects
- Electrical equipment or live circuits
- Heavy equipment or machinery operation
- Confined spaces or poor ventilation
- Tasks performed infrequently by workers (renovation work, deep cleaning)
How to Conduct a JHA
Follow these practical steps:
- Select the task: Choose one specific job, not a broad category. "Roof maintenance" is too general. "Replacing roof flashing on a pitched roof at 25 feet" is actionable.
- List each step: Write down every discrete action required to complete the task, in order. Most tasks have 4 to 12 steps.
- Identify hazards for each step: What could go wrong? Ask workers who perform the task regularly. They spot hazards that supervisors miss. Document the type of hazard: chemical, mechanical, thermal, ergonomic, or environmental.
- Assess severity: Would a hazard cause a minor injury, serious injury, or fatality? This determines control priority.
- Select controls: Eliminate the hazard first (remove the chemical, use a safer tool). If elimination is impossible, substitute with a safer method. Then apply engineering controls (ventilation, guarding). Use administrative controls (training, rotation to prevent repetitive strain). Finally, add personal protective equipment (PPE) as a last resort.
- Train workers: Review the JHA with all personnel who will perform the task before they start. This is distinct from a Toolbox Talk, which is shorter and less detailed.
JHA vs. JSA
A JHA and a JSA (Job Safety Analysis) are often used interchangeably, though some organizations distinguish between them. A JHA focuses on the hazards and controls. A JSA typically includes additional elements like the safe work procedure, sequence of steps, and potential consequences. In practice, the terms describe the same process, and using either name is acceptable.
Common Questions
- How often should I update a JHA? Review annually at minimum, and immediately if the task changes, equipment is replaced, or an incident occurs. If your facility underwent a safety audit and new hazards were identified, update relevant JHAs within 30 days.
- Who should conduct the JHA? Involve workers who actually perform the task, a safety manager or supervisor, and if available, an OSHA-trained safety professional. Do not let only office staff write them. Worker input catches real-world hazards.
- How detailed should controls be? Specify the exact control, not vague instructions. Instead of "use proper equipment," write "wear NIOSH-approved N95 respirator when grinding concrete without wet methods" or "use a 6-foot A-frame ladder with slip-resistant feet on level ground."