What Is a Job Hazard Analysis?
A Job Hazard Analysis (JHA) — also called a Job Safety Analysis (JSA) or Activity Hazard Analysis (AHA) — is a systematic process for identifying hazards associated with specific job tasks and determining the best way to control those hazards. OSHA considers JHAs a critical component of an effective safety and health management system.
While OSHA doesn't mandate JHAs under a single specific standard, they are referenced throughout OSHA's guidelines and are frequently requested during inspections. Many general contractors and project owners require JHA documentation as a condition of working on their sites.
The JHA Process: Step by Step
Step 1: Select the Job to Analyze
Prioritize jobs for analysis based on:
- Injury and illness history — Jobs that have produced injuries or near-misses
- Severity potential — Jobs where a single error could result in a serious injury or fatality
- New or modified jobs — Tasks where procedures have recently changed
- Infrequently performed jobs — Workers may not remember all hazards and controls
Step 2: Break the Job into Steps
Observe the work being performed and break it down into a sequence of discrete steps. Each step should describe a specific action. Keep the list manageable — typically 8 to 15 steps for most construction tasks. Too few steps may miss hazards; too many becomes unwieldy.
Step 3: Identify Hazards for Each Step
For every step in the job sequence, identify all potential hazards. Consider these categories:
- Struck-by — Falling objects, swinging loads, moving equipment
- Struck-against — Sharp edges, protruding objects, low clearances
- Caught-in/between — Rotating machinery, collapsing materials, pinch points
- Falls — Elevated work, slippery surfaces, unprotected edges
- Electrical — Overhead power lines, damaged cords, ungrounded tools
- Overexertion — Heavy lifting, awkward postures, repetitive motion
- Exposure — Chemicals, dust, noise, extreme temperatures
Step 4: Develop Hazard Controls
For each identified hazard, determine the appropriate control using the hierarchy of controls:
- Elimination — Remove the hazard entirely (most effective)
- Substitution — Replace with something less hazardous
- Engineering controls — Isolate workers from the hazard (guardrails, ventilation, barriers)
- Administrative controls — Change work practices, procedures, or scheduling
- PPE — Personal protective equipment (least effective — last resort)
Common Construction JHA Topics
Here are the most common construction activities that should have a dedicated JHA:
| Activity | Key Hazards | Primary Controls |
|---|---|---|
| Concrete formwork | Falls, struck-by, crush injuries | Fall protection, exclusion zones, shoring inspection |
| Steel erection | Falls, struck-by, collapse | PFAS, safety nets, bolting sequences |
| Roofing work | Falls, heat exposure, burns | Guardrails, warning lines, rest/shade |
| Excavation/trenching | Cave-in, utility strikes, falls | Shoring/sloping, utility locates, barricades |
| Scaffold erection | Falls, struck-by, collapse | Competent person, fall protection, base plates |
| Electrical rough-in | Electrocution, arc flash, falls | LOTO, insulated tools, de-energization |
| Welding/cutting | Burns, fire, fume exposure | Fire watch, ventilation, PPE |
| Crane operations | Struck-by, tip-over, electrocution | Signal person, load charts, clearances |
How to Use JHA Templates Effectively
A pre-built JHA template provides the structure and common hazards for specific tasks. Here's how to get the most value from templates:
- Customize for your site — Generic JHAs aren't enough. Add site-specific conditions, equipment, and personnel information.
- Review with the crew — Walk through the JHA before starting work. Workers on the task often identify hazards that were missed during planning.
- Update regularly — Revise JHAs when conditions change, new equipment is introduced, or incidents occur.
- Keep them accessible — JHAs should be available at the work location, not filed away in the job trailer.
Templates save significant time over writing from scratch while ensuring you don't miss critical hazards. Pair them with toolbox talks to reinforce hazard awareness and daily inspection forms to verify controls are in place.
OSHA Expectations During Inspections
When an OSHA compliance officer visits your site, they will often ask to see your JHAs for active work. Having well-documented, task-specific JHAs demonstrates that your company proactively identifies and controls hazards — which is exactly what OSHA's guidelines recommend.
The absence of JHAs doesn't result in a citation under a specific standard (since there's no JHA-specific regulation), but OSHA can use the General Duty Clause (Section 5(a)(1)) to cite employers who fail to address recognized hazards. A thorough safety program combined with task-specific JHAs significantly reduces your citation risk.
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