Hazard Classification

Hazard classification is the process of grouping food-safety hazards according to their nature so that a food business can identify, assess and control them. In a traditional food-safety framework, hazards are commonly grouped as biological, chemical and physical. Allergen hazards must also be identified and managed; some systems treat them as a distinct category, while others include them within chemical hazards.

Three common hazard categories

• Biological hazards: bacteria, viruses, parasites and other microorganisms that can cause illness. Examples include Salmonella, Listeria monocytogenes and norovirus.
• Chemical hazards: harmful chemicals or naturally occurring substances that may contaminate food, such as cleaning agents, lubricants not approved for the application, pesticide residues or certain toxins.
• Physical hazards: foreign objects that may cause injury, such as glass, metal fragments, hard plastic, stones or wood.
• Allergen hazards: undeclared or unintentionally transferred allergens, such as milk, egg, peanut, tree nuts, wheat, soy, fish, crustaceans, sesame or other allergens recognized by the applicable jurisdiction.

How hazard classification is used

During food-safety planning, the team identifies hazards that could occur at each stage of receiving, storage, preparation, cooking, cooling, packaging and service. Each hazard is assessed for likelihood and severity, then appropriate preventive measures or control steps are established.

Restaurant examples

Raw chicken contaminated with Campylobacter presents a biological hazard. Sanitizer residue on a cutting board is a chemical hazard. A broken piece of glass in a food container is a physical hazard. A sauce containing milk that is not declared to a guest presents an allergen risk.

Chef’s tip: Do not stop at naming the category. Identify the specific hazard, where it could enter the process, who may be exposed and what control will prevent or reduce the risk. Allergen controls require careful ingredient verification and cross-contact prevention, not simply a generic chemical-safety checklist.