Hazard
Every food safety system starts with the same question: what could harm someone? Before CCPs, before monitoring, before any of it — you have to name the hazards. Get this step wrong and everything downstream is built on sand.
Definition
A food safety hazard is a biological, chemical, or physical agent in food — or a condition of the food — with the potential to cause harm. (Many systems treat allergens as a fourth category, given their distinct behavior.)
Key facts
- Biological: bacteria (Salmonella, Listeria), viruses (norovirus), parasites (Toxoplasma), and the toxins some of them produce.
- Chemical: mycotoxins, pesticide residues, heavy metals, cleaning-chemical residues, process contaminants like acrylamide — and undeclared allergens, often listed separately.
- Physical: foreign bodies that injure — glass, metal, plastic, wood, bone fragments, stones.
- Hazard isn’t risk. The hazard is the agent; risk is likelihood × severity. Hazard analysis names the agents; risk assessment decides which ones deserve the heavy controls.
- Not every hazard is significant. The HACCP hazard analysis exists to sort the reasonably-likely from the theoretical — so controls land where they matter.
Why it matters
Hazard analyses fail in two directions: the inflated kind that lists everything including meteor strikes, and the thin kind that misses the obvious — like Listeria in a ready-to-eat plant. Both are failures. An inflated hazard list produces a bloated plan nobody follows; a thin one misses the hazard that causes the outbreak. The discipline is proportionality: identify completely, then assess honestly. It’s the highest-leverage step in HACCP, and it deserves the team’s best thinking, not a copied table.
A hazard analysis that lists everything but evaluates nothing is just a hazard list. The analysis step — deciding which hazards are significant for your product and process — is where expertise lives, and it’s what auditors probe. Significance decisions need justification: why this pathogen matters for this product, why that chemical doesn’t. Document the reasoning, not just the conclusion.
Sources: Codex CXC 1-1969; FDA.
Quick reference
| Type | Examples |
| Biological | Salmonella, norovirus, parasites |
| Chemical | Mycotoxins, residues, heavy metals |
| Physical | Glass, metal, plastic, bone |
| Allergenic | Milk, peanut, gluten (often separate) |