Traces of chemicals such as cleaning agents, sanitisers, pesticides or veterinary drugs that remain in or on food.
Traces of chemicals such as cleaning agents, sanitisers, pesticides or veterinary drugs that remain in or on food. Chemical residue is any leftover chemical substance that ends up in or on food and could harm the people who eat it. In a food business the most common sources are cleaning detergents and sanitisers that are not rinsed off properly, pest-control chemicals that drift onto food or surfaces, and machine lubricants or oils. Further up the supply chain, residues can come from agricultural pesticides, herbicides and veterinary medicines used in producing raw ingredients. The health effect depends on the chemical and the amount. Some cleaning-chemical residues cause immediate nausea, vomiting or a burning sensation, while low-level agricultural residues are managed through legal limits set for the whole food supply. In Australia, FSANZ sets maximum residue limits for agricultural and veterinary chemicals in the Food Standards Code, and these are monitored through national surveys to keep exposure within safe bounds. For a typical food premises, controlling chemical residue starts with using cleaning products and sanitisers exactly as the label directs, rinsing food-contact surfaces where required, and never leaving chemicals in unlabelled containers where they could be mistaken for food ingredients. Chemicals must be stored well away from food and packaging, and staff should be trained so that a sanitiser is not sprayed onto food or used at the wrong concentration. Standard 3.2.2 of the Food Standards Code requires food to be protected from contamination, which includes chemical contamination, and requires that chemicals used on the premises are handled and stored so they do not make food unsafe. Keeping cleaning chemicals in their original labelled containers, following supplier instructions, and separating chemical storage from food storage are the everyday safeguards. Businesses that buy raw produce rely on their suppliers, and Australia's maximum residue limits, to manage pesticide and veterinary residues. A staff member sanitises a food-preparation bench but does not wait for the surface to dry or rinse it as the product label directs, then immediately rolls pastry directly on the wet bench. Customers report a soapy taste and mild nausea. Following the sanitiser's stated contact time and wiping or rinsing before food contact would have prevented the residue from transferring to the food.
Frequently asked questions
What are the main sources of chemical residue in a food business?
Cleaning detergents and sanitisers that are not used or rinsed correctly are the most common on-site source, along with pest-control chemicals and machine lubricants. Raw ingredients can carry agricultural and veterinary residues from earlier in the supply chain.
What are maximum residue limits?
Maximum residue limits are the highest amounts of an agricultural or veterinary chemical legally permitted in a food. FSANZ sets these in the Food Standards Code and they are monitored to keep dietary exposure within safe levels.
How do I stop cleaning chemicals contaminating food?
Use products strictly per the label, observe the stated contact time and rinse where required, store chemicals away from food, keep them in labelled original containers, and train staff never to spray sanitiser onto food.
Why should chemicals never be decanted into unlabelled containers?
An unlabelled container of chemical can be mistaken for a food ingredient or water, leading to serious poisoning. Chemicals should stay in their original labelled packaging so their contents and hazards are clear.
Are agricultural chemical residues in food dangerous?
Australia sets legal maximum residue limits and monitors the food supply so that normal residues stay within safe levels. The bigger day-to-day risk in a food premises is misuse of on-site cleaning and pest chemicals.
