A contamination source is the origin from which a biological, chemical or physical hazard enters food, food-contact surfaces or the food-handling environment. Identifying the source is an important part of food-safety risk assessment and incident investigation because controls must address where the hazard originates as well as how it spreads.
Review the product, supplier and lot information, receiving conditions, preparation steps, storage locations, equipment, cleaning records and staff handling practices. Consider whether the hazard was already present in an ingredient or entered later during transport, storage, preparation or service. Preserve relevant evidence and follow the operation’s incident procedure; do not assume the first suspected source is the confirmed cause.
The source is the origin of the hazard. The route is the pathway by which it reaches another food or surface. For example, raw poultry may be the source of a biological hazard, while a shared cutting board and knife provide the route to a ready-to-eat salad.
Use approved suppliers, inspect deliveries, verify product condition, store chemicals separately, maintain equipment, control pests and require staff to follow health and hygiene procedures. Where a hazard cannot be eliminated at its source, use suitable controls to prevent it from reaching food.
Example: A restaurant investigation identifies a damaged chemical container stored above a food-preparation area as the likely source of a chemical contamination risk. Management isolates affected food, removes the chemical, assesses the area and corrects the storage arrangement.
Chef’s tip: Distinguish confirmed facts from possible causes in an investigation. Traceability and accurate records help identify the source without relying on assumptions.
Key distinction: A contamination source is where the hazard originates; a contamination route is how the hazard is transferred.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
