What Is a Job Hazard Analysis (JHA)?

Definition: what a JHA actually is

A Job Hazard Analysis (JHA) — also called a Job Safety Analysis (JSA) in some industries — is a structured method for identifying the hazards in a specific job task and determining the controls needed to perform that task safely. It's the document a competent person produces before work begins, not the form a safety manager fills out after an incident.

The output is a structured table: every task in the job has its own row, listing the hazards present in that task and the controls (engineering, administrative, PPE) that will reduce risk to an acceptable level. A good JHA reads like a recipe — it tells the crew, step by step, how to do the work without getting hurt.

OSHA's Publication 3071 ("Job Hazard Analysis") is the federal guidance document on the practice. It's not a regulation in the same sense as 29 CFR 1926 — there's no specific OSHA standard that requires a JHA on every task — but the General Duty Clause (29 USC §654(a)(1)) requires employers to provide a workplace free from recognized hazards. A JHA is the documented evidence that you've recognized the hazards and addressed them.

JHA vs. JSA vs. Risk Assessment — what's the difference?

Three terms get used somewhat interchangeably. The distinctions:

• →JHA — Job Hazard Analysis. OSHA's preferred term. Focuses on identifying hazards in tasks and selecting controls. Used most often in U.S. construction and general industry.
• →JSA — Job Safety Analysis. Functionally the same as JHA. Term more common in oil & gas, process industries, and international contexts.
• →Risk Assessment — Broader, often more quantitative. Includes likelihood × severity scoring. Common in heavy industrial, regulatory frameworks like ISO 45001, and European workplaces.

For most U.S. construction and EH&S work, "JHA" is the term to use. The document and the process are essentially the same regardless of which acronym you put on it.

Why OSHA expects JHAs (even though it doesn't always mandate them)

OSHA does not have a regulation titled "JHAs Required." What OSHA does have is the General Duty Clause and a series of specific standards that effectively require pre-task hazard analysis — even if they don't use the term "JHA."

Standards that effectively require a JHA:

• →29 CFR 1910.132(d) — General Industry PPE hazard assessment. Requires a written certification that the workplace has been assessed for hazards requiring PPE.
• →29 CFR 1926.502(d) — Construction fall protection systems. Requires a written fall protection plan in scenarios where conventional fall protection is infeasible.
• →29 CFR 1910.146 — Permit-required confined spaces. Requires written entry permits with hazard analysis.
• →29 CFR 1910.119 — Process Safety Management. Requires Process Hazard Analyses for covered processes.
• →29 CFR 1910.147 — Lockout/tagout. Requires written energy control procedures per machine.

When OSHA inspects a job site after an incident, the first question is often: "Did you have a hazard analysis for this task?" Producing a JHA that addresses the specific hazard that led to the incident demonstrates due diligence. Producing nothing, or a generic JHA that doesn't address the specific work, is a citation magnet.

The 4-step JHA process

Step 1 — Break the job into tasks

A "job" is something like "install rooftop HVAC unit." A "task" is one of the discrete steps required: receive equipment at staging, rig and hoist to roof, position on curb, secure to curb, connect refrigerant lines, connect electrical, start up and test. Each task gets its own row on the JHA. Keep tasks small enough that their hazards are coherent — if a single task has more than four or five distinct hazards, it's actually two or three tasks.

Step 2 — Identify hazards in each task

For each task, walk through the hazard categories systematically. Don't rely on what comes to mind — use a checklist. Categories to consider:

• →Physical hazards — slips, trips, falls, struck-by, caught-in, caught-between, pinch points, sharp edges, hot surfaces.
• →Chemical hazards — solvents, adhesives, paints, cleaning agents, fuels, refrigerants, silica, lead, anything covered by HAZCOM (29 CFR 1910.1200).
• →Biological hazards — mold, bacteria in standing water, blood and bodily fluids on remediation work.
• →Ergonomic hazards — lifting, repetitive motion, awkward postures, vibration, prolonged kneeling.
• →Electrical hazards — shock, arc flash, arc blast, contact with overhead lines, improper grounding.
• →Thermal and environmental — heat stress, cold stress, UV, wind, lightning, precipitation.
• →Noise — sustained levels above 85 dBA require hearing conservation.
• →Confined space — engulfment, oxygen deficiency, atmospheric hazards.
• →Energy isolation — lockout/tagout failures, stored energy in springs, hydraulics, capacitors.

Step 3 — Determine controls using the hierarchy

For every identified hazard, select controls starting from the top of the hierarchy and working down. The discipline that separates a competent JHA from a mediocre one is forcing yourself up the hierarchy. The lazy answer to every hazard is "wear PPE." The right answer is often "design the hazard out, and require PPE as backup."

Step 4 — Document and train

A JHA on a clipboard that no one reads is decorative. Every worker performing the task must be briefed on the JHA, sign acknowledgment, and have the opportunity to add hazards or controls based on field experience. The JHA is updated when conditions change — new equipment, new weather, new sub on the work area, anything that materially changes the hazard profile.

Worked example: single-ply roofing JHA

Job: install TPO membrane on a 12,000 sq ft low-slope commercial roof. Three-person crew. Two-day duration.

Common JHA mistakes

• →Writing JHAs in the office for tasks the writer has never performed. The crew that does the work has the best hazard knowledge.
• →Generic JHAs reused across sites — a fall protection JHA written for a flat roof won't catch the hazards of a pitched roof.
• →Treating JHAs as a one-time deliverable rather than a living document. Weather changes. Conditions change. The JHA changes with them.
• →Skipping the briefing and signing step — workers who don't know what the JHA says cannot follow it.
• →PPE-only controls. If every row on your JHA ends with "wear hard hat, safety glasses, vest" you haven't done the analysis.
• →No closeout review. The JHA process should include a check after the work: were there hazards we missed? Should the JHA be updated for next time?

When to use AI for JHA creation

AI-assisted JHA generation is one of the highest-leverage applications of AI in safety work. A typical JHA on a complex task takes a competent person 30–60 minutes to write from scratch. Multiply by every distinct task on a project, and the safety team is buried before the first board is hung.

AI-assisted tools change the math. You describe the task — "install rooftop HVAC unit, 4-ton package unit on a 22-foot roof using a crane" — and the system generates a draft JHA with task breakdown, hazards, OSHA citations, controls, and PPE. The safety manager reviews, edits for site-specific conditions, and signs out in five to ten minutes instead of forty-five.

The AI draft is not a substitute for a competent person's review. It's a starting draft that captures the routine 80% of any JHA — the hazards everyone in the trade knows about, the OSHA citations, the standard controls — so the competent person can focus on the site-specific 20% that requires judgment.

SafeBrief's JHA builder uses Claude AI to draft JHAs in roughly 60–90 seconds. The builder is included in the Pro plan at $29/month, alongside the team management, OSHA inspection templates, and equipment registry features.