What Is a JSA (Job Safety Analysis)?
A Job Safety Analysis (JSA) is a procedure that breaks a job down into individual steps, identifies the hazards in each step, and defines the controls needed to do the work safely. It is completed before the task starts and reviewed with the crew doing the work. JSA is used interchangeably with JHA (Job Hazard Analysis).
The three columns of every JSA
However it is formatted, a JSA answers three questions in order. Each job step gets its own row, so a five-step job produces five sets of hazards and controls.
- Job steps — the task broken into the sequence of actions a worker actually performs.
- Hazards — what could cause harm in each step (struck-by, caught-between, H2S exposure, dropped objects, energy release).
- Controls — the specific measures that remove or reduce each hazard, ordered by the hierarchy of controls (eliminate, substitute, engineer, administrate, PPE).
JSA vs. JHA — is there a difference?
No meaningful difference. JSA (Job Safety Analysis) and JHA (Job Hazard Analysis) describe the same exercise; the term used is mostly regional and company preference. OSHA publishes its version as a Job Hazard Analysis (Publication 3071). Some operators reserve "JHA" for the formal written analysis and "JSA" for the field-level pre-job review, but the method is identical.
A field example
Take "change out a valve on a pressurized line." Step one is isolate and lock out the line — the hazard is stored energy and accidental release, and the control is LOTO with a verified zero-energy state. Step two is bleed off pressure — the hazard is a trapped-fluid or gas release, and the control is bleeding to a safe location while monitoring for H2S. Each remaining step is analyzed the same way until the job is complete.
Who writes a JSA and when
The crew performing the work writes or reviews the JSA before the job begins, led by the supervisor or a competent person. It is a living document: if conditions change — weather, a new hazard, a different crew — the JSA is updated and re-reviewed. Everyone on the job signs off to confirm they understand the hazards and controls.
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Build a JSA free — no signupFrequently Asked Questions
What does JSA stand for?
JSA stands for Job Safety Analysis. It is also called a JHA (Job Hazard Analysis) — the two terms refer to the same process of breaking a job into steps, identifying hazards, and defining controls.
What is the difference between a JSA and a JHA?
There is no practical difference. Both break a task into steps and analyze the hazards and controls for each. OSHA uses the term Job Hazard Analysis; many oilfield and construction crews say JSA. Some companies use JHA for the formal written document and JSA for the field-level review.
When should a JSA be completed?
Before the job starts, and again whenever conditions change. The crew doing the work reviews and signs the JSA at the worksite so everyone understands the hazards and controls before any work begins.
What are the main steps of a JSA?
Break the job into sequential steps, identify the hazards in each step, determine the controls for each hazard using the hierarchy of controls, then review and sign off with the crew before work begins.