A chemical hazard in food safety is a chemical substance present in food at a level or in a form that could cause harm to a consumer. Chemical hazards may enter food through ingredients, agricultural production, processing, equipment, cleaning, storage or accidental contamination. They can be naturally occurring, intentionally added or introduced unintentionally.
Common types of chemical hazards
- Cleaning and sanitation chemicals: detergent, sanitizer, degreaser or rinse-aid residues caused by incorrect dilution, storage or use.
- Agricultural and environmental contaminants: pesticide residues, heavy metals and other contaminants from raw materials or the environment.
- Food additives and processing aids: substances used incorrectly or above permitted limits, including certain preservatives, colours and sulphites.
- Equipment-related chemicals: non-food-grade lubricants, maintenance chemicals or substances migrating from unsuitable food-contact materials.
- Naturally occurring toxins: toxins in certain mushrooms, seafood, plants or mould-contaminated ingredients.
- Allergens: undeclared allergens and allergen cross-contact are major food-safety concerns and must be managed through ingredient verification and preventive controls.
Examples in a professional kitchen
A sanitizer is accidentally sprayed onto uncovered food; a degreaser is stored above ingredients and leaks; an ingredient contains an undeclared sulphite; or a lubricant not approved for the application contaminates a food-contact surface. Each situation requires the affected food or equipment to be assessed and controlled according to the food-safety plan.
How to prevent chemical contamination
- Store chemicals in clearly labelled, designated areas away from food and packaging.
- Follow product label instructions for dilution, application, contact time and rinsing.
- Use only lubricants and maintenance products approved for the equipment application.
- Verify supplier specifications and ingredient declarations, including allergens and additives.
- Keep chemicals in their original containers and never use food containers for chemical storage.
- Train staff to report spills, leaks, incorrect concentrations and suspected contamination immediately.
Chemical hazard versus physical and biological hazard
A chemical hazard involves a harmful substance, a physical hazard involves a foreign object such as glass or metal, and a biological hazard involves microorganisms or biological agents capable of causing illness. A single incident can involve more than one hazard category.
Chef’s tip: If food may have been contaminated by a chemical, isolate it and follow the food-safety plan and local authority guidance. Do not attempt to make it safe by rinsing, reheating or tasting it.
