Job Hazard Analysis (JHA)

What is a Job Hazard Analysis?

A job hazard analysis (JHA) is a way to identify hazards in a job before someone gets hurt. The idea is simple: look at each step of a task and ask what could go wrong, then figure out how to prevent it. A good JHA looks at the relationship between the worker, the task, the tools, and the work environment.

OSHA describes the process as “a technique that focuses on job tasks as a way to identify hazards before they occur. It focuses on the relationship between the worker, the task, the tools, and the work environment. Ideally, after you identify uncontrolled hazards, you will take steps to eliminate or reduce them to an acceptable risk level.” (OSHA 3071, 2002 Revised)

The Department of Energy (DOE) considers it “the most basic and widely used tool to identify hazards associated with jobs at the activity level. JHAs can satisfy a large portion of the worker protection hazard identification requirements at most workplaces. A JSA is useful for dynamic work environments like equipment repair as well as relatively stable environments such as operating a chemical process.” (Implementation Guide for use with 10 CFR Part 851)

JHA vs. JSA vs. AHA

The terms job hazard analysis (JHA), job safety analysis (JSA), and activity hazard analysis (AHA) all describe the same process. Which name you use depends on your industry and your client:

• JHA (Job Hazard Analysis) - the term OSHA uses in its own publications. Common in general industry.
• JSA (Job Safety Analysis) - the most widely recognized term. Common in construction, oil & gas, and manufacturing.
• AHA (Activity Hazard Analysis) - used by the U.S. Army Corps of Engineers (USACE) and Department of Defense contractors. Required under EM 385-1-1.

The process itself is identical: break a job into steps, identify the hazards at each step, and figure out the controls needed to protect workers.

The JHA Process

A job hazard analysis follows four steps, as outlined in OSHA Publication 3071:

1. Select the Job

Not every task needs its own JHA. Prioritize jobs with the highest injury or illness rates, jobs where a single error could cause a severe injury or death, newly established or modified jobs, and jobs complex enough that written instructions are needed.

2. Break the Job into Steps

Observe the work being performed and break it into a sequence of steps. Each step should describe what is done, not how to do it. Aim for 10 to 15 steps. Too few and you’ll miss hazards; too many and the analysis becomes unwieldy.

3. Identify the Hazards

For each step, ask: what could go wrong? Think about struck-by, caught-in/between, falls, electrical contact, chemical exposure, extreme temperatures, ergonomic strain, and anything else specific to the job. Look at the tools, the environment, the materials, and the people doing the work.

4. Determine Preventive Controls

For each hazard, decide what it takes to eliminate or reduce it. The hierarchy of controls is the standard framework: elimination, substitution, engineering controls, administrative controls, and personal protective equipment (PPE). The best controls remove the hazard entirely. PPE is always the last resort.

When to Perform a JHA

A JHA isn’t something you do once and file away. OSHA recommends performing or updating a JHA when:

• New or unfamiliar tasks - before the team starts a job they haven’t done before.
• Changed conditions - the location, equipment, materials, or procedures have changed.
• After an incident or near-miss - to figure out what was missed and keep it from happening again.
• New equipment or materials - new tools, chemicals, or machinery are being introduced.
• Periodic reviews - on a regular schedule to catch hazards that have crept in over time.

When deciding which jobs to tackle first, start with the ones that have the highest injury rates, the worst potential consequences, or that have been recently changed.

Benefits of Job Hazard Analysis

Companies that do JHAs consistently tend to see real results:

• Fewer injuries and incidents. Finding hazards before work starts is the most straightforward way to prevent them.
• Regulatory compliance. OSHA’s General Duty Clause requires employers to provide a workplace free of recognized hazards. A documented JHA shows you’ve done your homework.
• Better training. A completed JHA doubles as a training document. New workers get step-by-step guidance on how to do the job safely.
• Worker buy-in. When frontline workers help build the JHA, they own the safety procedures. They also catch hazards that management won’t see from behind a desk.
• Incident investigation. When something goes wrong, the JHA gives you a baseline to compare against. What changed? What step was skipped?

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