Ensuring food safety means not only monitoring what goes into food but also what might end up there unintentionally. Food contaminants are substances that are not added on purpose, but may be present because of environmental pollution, agricultural practices or processing methods. Even at low levels, contaminants can pose health risks over time, making their control a key part of the EU's food safety strategy.
What are food contaminants?
Contaminants can be found throughout the food chain, from soil and water to the final stages of production. They include naturally occurring toxins, industrial residues, heavy metals and by-products formed during food processing.
The EU has established specific rules to monitor and limit the presence of the following categories of contaminants:
- mycotoxins – toxins produced by moulds that can grow on crops like grains and nuts
- plant toxins – naturally occurring compounds found in certain seeds, herbs, or plants
- heavy metals – elements such as lead, cadmium, mercury, arsenic and tin that can accumulate in the body and cause long-term harm
- persistent organic pollutants (POPs) – industrial chemicals such as dioxins, PCBs and some fluorinated substances that remain in the environment and food chain
- processing contaminants – compounds that form during cooking or manufacturing, including polycyclic aromatic hydrocarbons (PAHs) and 3-MCPD
- other substances – contaminants such as nitrates, melamine and perchlorate.
How are contaminants controlled?
The EU sets legally binding maximum levels for many contaminants in specific food categories. These limits are based on scientific advice from the European Food Safety Authority (EFSA), which evaluates the health risks associated with different substances.
EU member states are responsible for monitoring the food supply, conducting regular testing and submitting results to the European Commission and EFSA. This data helps identify trends, emerging risks and the effectiveness of current legislation.
If contamination levels exceed safe limits, food products must be withdrawn or recalled.
Resources
Food contaminants are substances not intentionally added to food, but which may be present due to environmental pollution, agricultural practices, or processing methods. Even in small amounts, some contaminants can pose risks to human health over time. Monitoring and limiting their presence is a key part of the EU’s approach to ensuring food safety.