Understanding Sanitary and Phyto-sanitary Measures (SPS) in International Trade

Every time a shipment of fruit, meat, or grain crosses an international border, it passes through an invisible regulatory gate. That gate is governed by Sanitary and Phytosanitary (SPS) measures – rules that determine whether a product is safe enough to enter a country, and whether it poses any biological risk to local agriculture or public health. For anyone working in food production, agri-business, or trade policy, understanding how SPS measures work is not optional – it is foundational.

What are sanitary and phytosanitary measures? 🔗

According to the World Trade Organization (WTO), SPS measures are regulations applied by governments to protect human, animal, and plant life or health from risks that can travel through food and agricultural trade. In plain terms, “sanitary” measures relate to human and animal health – think food contamination, disease outbreaks, or unsafe drug residues in meat. “Phytosanitary” measures deal specifically with plant health – pest infestations, crop diseases, and invasive species that could devastate local ecosystems.

These measures can take many practical forms: a country may require that imported apples be free of a specific fungus, that poultry products be tested for avian influenza, or that timber be heat-treated to eliminate wood-boring insects. As Australia’s Department of Agriculture notes, SPS measures are essentially biosecurity tools designed to prevent the entry of pests, diseases, contaminants, and toxins through trade channels.

The SPS Agreement: science, sovereignty, and fair trade 🔗

The Agreement on the Application of Sanitary and Phytosanitary Measures came into force on 1 January 1995, alongside the establishment of the WTO. It grew out of growing concerns during the Uruguay Round of trade negotiations that SPS measures were being misused as disguised trade barriers – that is, governments were using health regulations not to genuinely protect consumers or ecosystems, but to block foreign competition. The SPS Agreement was designed to close that loophole.

The agreement strikes a deliberate balance. On one hand, it affirms every government’s sovereign right to decide how much health risk it is willing to accept – this is called the Appropriate Level of Protection (ALOP). On the other, it insists that any SPS measure must be grounded in science, applied only to the extent necessary, and not used as a disguised restriction on trade. Under the agreement, the WTO constrains member-state policies relating to food safety – covering bacterial contaminants, pesticides, inspection, and labelling – as well as measures regarding animal and plant quarantine.

The science requirement and risk assessment 🔗

A central pillar of the SPS Agreement is that measures must be based on scientific evidence and risk assessment. Governments cannot simply ban a product because of vague concerns – they must demonstrate that the measure is a response to an identifiable, assessed risk. Article 5 of the agreement requires that SPS measures be based on a proper risk assessment, taking into account techniques developed by relevant international organizations. Where scientific evidence is insufficient, countries may provisionally apply precautionary measures, but they are obligated to seek additional information for a more thorough review.

Harmonization and the “Three Sisters” 🔗

To prevent a chaotic patchwork of national rules from fragmenting global trade, the SPS Agreement strongly encourages harmonization – the process of aligning national measures with internationally agreed standards. Three organizations are specifically designated for this role, and they are widely known in trade circles as the “Three Sisters.”

As documented in a joint publication by all three bodies, the Three Sisters are recognized as the key standard-setting organizations under the WTO’s SPS Agreement, with their respective Observatories monitoring global trends, compliance, and challenges in food safety, plant health, and animal health.

• Codex Alimentarius Commission (Codex) – for food safety standards
• World Organisation for Animal Health (WOAH, formerly OIE) – for animal health and zoonotic diseases
• International Plant Protection Convention (IPPC) – for plant health and phytosanitary measures

When a country bases its national SPS requirements on the standards set by these three bodies, it is generally presumed to be in compliance with the SPS Agreement and faces a much lower risk of legal challenge at the WTO.

Codex Alimentarius: the global benchmark for food safety 🔗

Established in 1963 as a joint initiative of the Food and Agriculture Organization (FAO) and the World Health Organization (WHO), the Codex Alimentarius Commission develops internationally harmonized food standards, guidelines, and codes of practice to protect consumer health and facilitate fair food trade. Its standards cover everything from food additives and contaminants to labelling and hygiene requirements.

One of its most critical functions under the SPS Agreement is setting Maximum Residue Limits (MRLs) for pesticides. An MRL is the highest level of a pesticide residue that is legally tolerated in or on food when pesticides are applied correctly according to Good Agricultural Practice. MRLs serve a dual purpose: they protect consumer health by keeping residue levels within safe thresholds, and they facilitate trade by providing a shared reference standard.

As of November 2024, the Codex Alimentarius Commission had adopted 6,453 MRLs and 63 Extraneous Maximum Residue Limits (EMRLs) covering different pesticide-commodity combinations. Before any Codex MRL is established, the Joint FAO/WHO Meeting on Pesticide Residues (JMPR) must conduct a human health risk assessment, reviewing toxicology data and residue field trials to ensure the food supply remains safe. Only after this scientific review does the Codex Committee on Pesticide Residues (CCPR) consider officially adopting the limit.

Countries that set MRLs stricter than Codex standards are permitted to do so – but the SPS Agreement requires them to provide scientific justification demonstrating why the international standard is insufficient for their desired level of health protection.

IPPC: safeguarding plants across borders 🔗

The International Plant Protection Convention (IPPC) is the sole international treaty dedicated to plant health under the SPS Agreement. The WTO recognizes the IPPC as the only international standard-setting organization for plant health under the SPS framework. Currently, 184 countries are signatories to the convention, making it one of the most widely adopted agricultural agreements in the world.

The IPPC develops International Standards for Phytosanitary Measures (ISPMs), which cover a wide range of plant health concerns: pest risk analysis, pest surveillance, regulation of wood packaging materials in international trade, inspection protocols, pest reporting, and the international movement of seeds. Pests are responsible for between 20 and 40 percent of global crop yield losses, and plant pests and diseases cost the global economy more than USD 220 billion annually – figures that underline why phytosanitary standards are not bureaucratic formalities but economic necessities.

The IPPC provides a framework for implementing phytosanitary measures and fosters international cooperation in managing invasive alien species, working in parallel with the WTO SPS Agreement to ensure that plant health measures are scientifically justified and do not create unnecessary trade barriers. Specific ISPMs – such as ISPM 2 and 11 on pest risk analysis, ISPM 6 on pest surveillance, and ISPM 12 on export certification – guide countries in developing consistent, trade-safe phytosanitary systems.

WOAH: protecting animal health and preventing zoonotic disease 🔗

The World Organisation for Animal Health (WOAH), originally established as the Office International des Epizooties (OIE) and renamed in 2022, is the SPS Agreement’s designated reference body for animal health and zoonotic diseases. WOAH sets international standards, guidelines, and recommendations that WTO members are encouraged to use as the basis for their animal health-related SPS measures.

WOAH’s standards govern how countries should handle disease surveillance, animal disease notification, veterinary inspection, and import/export controls for live animals and animal products. A well-known real-world example of the SPS Agreement’s application in animal health was the hormone-treated beef dispute. In 1996, the United States and Canada challenged EU directives before the WTO that prohibited the import of meat treated with certain growth hormones. The EU argued the measure was justified on health grounds; WTO adjudicating bodies ultimately found in favor of the US and Canada, ruling that the EU directives were not sufficiently backed by scientific risk assessment. This case became a landmark example of how the science requirement in SPS measures is enforced in practice.

Inspection protocols, product treatments, and compliance 🔗

Beyond the setting of standards, SPS measures are operationalized through a range of practical tools. The SPS Agreement allows countries to use different methods of control, inspection, and approval procedures to verify compliance with adopted standards. These tools include:

• Border inspections: Physical examination and laboratory testing of imported consignments for contaminants, pests, or disease agents.
• Product treatments: Requirements that certain products undergo heat treatment, fumigation, irradiation, or other approved processes before entry.
• Certification systems: Export certificates issued by national authorities confirming that a product meets the importing country’s SPS requirements.
• Equivalence determinations: Recognition that a different SPS system achieves the same level of protection, reducing duplicative requirements for trusted trading partners.

Transparency: a non-negotiable obligation 🔗

One of the SPS Agreement’s most practical provisions is the requirement for transparency. Governments must notify other WTO members of any new or modified SPS measures – particularly those that differ from international standards – and provide a comment period during which trading partners can raise concerns before a measure is finalized. The WTO’s ePing platform allows members and their stakeholders to receive real-time alerts on SPS notifications relevant to their export markets and products. Each WTO member must also establish a National Notification Authority (NNA) to issue SPS notifications and a National Enquiry Point (NEP) to respond to queries from trading partners.

This transparency architecture is critical for exporters. Without advance notice of regulatory changes, farmers, processors, and exporters can find themselves locked out of markets overnight – not because their products are unsafe, but because compliance requirements shifted without warning.

SPS measures and developing countries 🔗

A recurring concern in international trade discussions is the disproportionate burden that stringent SPS requirements place on developing countries. Meeting international standards requires laboratory infrastructure, trained inspection personnel, robust disease surveillance systems, and functioning food safety agencies – all of which demand significant investment. Although SPS measures are essential for food safety and environmental protection, they often function as non-tariff barriers, particularly in developing countries, where compliance costs can be prohibitive and technical capacity limited.

The SPS Agreement acknowledges this reality. It grants developing countries extended transition periods for implementation, and mandates that WTO members facilitate technical assistance. The Standards and Trade Development Facility (STDF) – a joint initiative of the WTO, WHO, World Bank, WOAH, and FAO – exists specifically to help developing countries build the capacity needed to comply with and benefit from SPS standards in global trade.

Why SPS measures matter beyond trade compliance 🔗

It is easy to view SPS measures purely as a compliance challenge – a set of boxes to check before entering a market. But their significance runs deeper. Effective SPS systems protect domestic agriculture from foreign pests and diseases that could devastate crop yields. They shield consumers from contaminated food. They prevent the entry of invasive species that can irreversibly alter ecosystems. And when functioning well and applied in good faith, they provide a level playing field for trade in agricultural goods.

The tension the SPS Agreement manages – between national health sovereignty and open international trade – is not one that will ever be fully resolved. What the agreement provides is a science-based, transparent, and multilaterally agreed framework for navigating that tension. For food and agriculture professionals, understanding this framework is essential to operating effectively in a world where borders are permeable but standards are not.

What do you think? As food supply chains become more globally integrated, should international SPS standards be made legally binding rather than recommendatory for WTO members? And how can developing countries more effectively participate in standard-setting processes at bodies like Codex and the IPPC to ensure the resulting rules reflect their agricultural realities?

References

1. https://www.wto.org/english/tratop_e/sps_e/sps_e.htm
2. https://www.agriculture.gov.au/biosecurity-trade/market-access-trade/wto/sps
3. https://www.wto.org/english/tratop_e/sps_e/spsund_e.htm
4. https://en.wikipedia.org/wiki/Agreement_on_the_Application_of_Sanitary_and_Phytosanitary_Measures
5. https://www.wto.org/english/tratop_e/sps_e/spsagr_e.htm
6. https://www.ippc.int/en/news/new-joint-publication-available-monitoring-and-evaluation-of-sanitary-and-phytosanitary-measures-sps-success-and-challenges-of-codex-alimentarius-ippc-and-woah/
7. https://www.fao.org/fao-who-codexalimentarius/thematic-areas/pesticides/en/
8. https://www.fao.org/fao-who-codexalimentarius/codex-texts/maximum-residue-limits/en/
9. https://foodsafety.institute/food-laws-standards/codex-residue-limits-tbt-agreement/
10. https://www.ippc.int/en/about/overview/
11. https://link.springer.com/article/10.1007/s44279-025-00301-9