Hazard Identification and Job Analysis

Hazard identification starts before the event

A hazard is a source or situation with the potential to cause injury, illness, property damage, environmental harm, or other loss. Hazard identification is the disciplined search for those sources before people are harmed. It spans physical, chemical, biological, ergonomic, psychosocial, energy, environmental, and organizational contributors.

Do not limit the search to routine production. Many serious exposures occur during setup, cleaning, line clearing, maintenance, troubleshooting, startup, shutdown, contractor work, emergency response, and changes in equipment or materials. A workplace that looks controlled during normal operation can become far more hazardous when a guard is removed, a valve is opened, or an employee reaches into a jammed machine.

Job hazard analysis

A job hazard analysis (JHA) — also called a job safety analysis (JSA) — breaks a job into steps, identifies hazards for each step, evaluates exposure, and selects controls. OSHA's recommended method (Publication 3071) is a four-part loop: select the job, break it into steps, identify hazards at each step, and determine preventive measures. The strongest JHAs are built with the people who do the task and verified by observing actual work; a JHA copied from another site without field review misses layout, staffing, climate, communication, and maintenance differences.

Make steps and hazards specific

A JHA must not become a paperwork exercise. Each step should be specific enough to reveal hazards. "Clean tank" is too broad; useful steps include isolate equipment, verify zero energy, open the access point, test the atmosphere, ventilate, enter, remove residue, and exit — each with distinct hazards and controls.

The hazard description should name the harmful mechanism. Instead of "poor housekeeping," write "slip hazard from oil on the walking surface near the press." Instead of "chemical hazard," write "solvent vapor inhalation during open-container transfer." Specific hazards lead to specific controls — and to correct quiz answers, because vague distractors such as "employee was careless" never name a mechanism.

Risk thinking starts during identification

Risk thinking begins here. Ask who is exposed, how often, for how long, under what conditions, and with what severity if controls fail. Include employees, temporary workers, contractors, visitors, maintenance personnel, emergency responders, and nearby operations. Also ask whether existing controls are engineered, administrative, PPE-based, informal, missing, or defeated.

Worked example: a packaging line has never produced a recordable injury, but operators report clearing jams roughly 15 times per shift by reaching past a partially open guard while the conveyor still has stored energy. The low lagging metric is misleading — this is a high-energy, high-frequency nonroutine task. The correct ASP move is to analyze the jam-clearing task now, with worker input, and apply energy isolation and a guard redesign, rather than wait for an injury to "confirm" the hazard.

A practical JHA workflow:

• Select the job based on risk, frequency, change, or incident history.
• Involve workers and supervisors familiar with the task.
• Break the job into clear, specific steps.
• Identify hazards and exposure at each step.
• Choose controls using the hierarchy of controls.
• Communicate, train on, and verify the revised method.
• Review after changes, incidents, or field feedback.

Common trap: distractors that jump straight to discipline, generic annual retraining, or PPE without first understanding the task. Worker input improves identification but never replaces observation, verification, or management responsibility.

Energy and exposure as organizing lenses

Two lenses sharpen hazard identification on the exam. The first is the energy concept: harm comes from an uncontrolled release of energy — kinetic, potential (gravity), electrical, chemical, thermal, radiation, mechanical, or pressure. Asking "what energy could reach a person here?" surfaces hazards a tidy walkthrough misses, especially stored energy in springs, capacitors, pressurized lines, or raised loads that lockout/tagout must address.

The second is occupational health exposure, where the question is not "could it strike a person" but "what dose accumulates over time." Health hazards such as noise, airborne contaminants, heat, and radiation require quantification against limits — for example the OSHA permissible exposure limits (PELs) or the ACGIH Threshold Limit Values (TLVs) — using sampling rather than visual inspection. A task can look clean yet produce an overexposure, so identification must include monitoring data, not just observation.

Proactive identification programs

Hazard identification is a continuous program, not a one-time event. Mature systems combine scheduled inspections, behavior-based safety observations, hazard-reporting cards, pre-task planning or "take-five" reviews, and management of change triggers. Each method catches a different signal: inspections catch condition hazards, observations catch act and exposure hazards, and reporting cards catch the worker knowledge that audits miss. Worked example: a site relies solely on a quarterly checklist inspection and is surprised by an ergonomic injury cluster in shipping.

The checklist never prompted ergonomic exposure; adding worker reporting and a task-level JHA on the repetitive lifting station would have surfaced the awkward-posture, high-frequency hazard long before the strain claims appeared. The takeaway: layer multiple methods, weight them toward proactive and nonroutine work, and feed findings into risk assessment rather than filing them.