Canada’s dairy supply management system is once again at the center of a major trade dispute. As Canada and the United States move closer to finalizing a new trade deal, the key question is whether Canada can protect its dairy quotas while still giving American farmers more access. President Donald Trump claims tariffs on U.S. dairy exports will drop to zero. However, Canadian officials insist the supply management structure itself will stay intact.

This disagreement highlights a deeper tension. Both governments agree that change is coming, yet they disagree sharply on what that change should look like. Meanwhile, dairy farmers, processors, and consumers on both sides of the border are watching closely to see how the final deal takes shape.

What the US Wants From Canada’s Dairy Market

Canada’s supply management system limits how much foreign dairy can enter tariff-free. Once imports exceed a set quota, steep tariffs kick in. As a result, American exporters have long argued that this structure blocks fair access to Canadian consumers.

Under the Canada-U.S.-Mexico Agreement (CUSMA), the U.S. gained access to a larger share of Canada’s dairy market through tariff-rate quotas. According to the Dairy Processors Association of Canada, this arrangement gives the U.S. duty-free access to nearly four percent of the Canadian market. Still, American producers argue the real problem lies in how those quotas get distributed.

Most tariff-rate quotas currently go to Canadian processors rather than retailers or distributors. Consequently, U.S. industry groups say this creates a built-in disincentive to import competing products. Jamie Castaneda, an executive at the U.S. National Milk Producers Federation, put it plainly: “The U.S. dairy industry has never been after supply management.” Instead, he argues Canada uses quota allocation as a quiet barrier to trade.

Food economist Mike von Massow of the University of Guelph explains the logic simply. Processors who already produce cheese domestically have little reason to import the same product from abroad. If quotas instead went to distributors or grocery chains, he notes, those businesses would have stronger incentives to bring in a wider range of American dairy goods.

Despite two CUSMA dispute panels reviewing the issue, the outcomes were mixed. The first, held in 2021, found Canada had acted inconsistently in distributing quotas. Canada later adjusted its procedures, yet a second panel eventually sided with Canada. Even so, American exporters maintain that access remains limited in practice.

Trade data supports part of that debate. American dairy exports to Canada grew from 93,525 metric tonnes in 2020 to 145,662 metric tonnes in 2025, worth roughly US$1.38 billion. Even with this growth, U.S. producers argue Canada’s quota system still keeps them from reaching their full market potential.

Why Canada Is Resisting Deeper Concessions

Canadian officials have been firm about protecting the core of supply management. Trade Minister Dominic LeBlanc addressed the issue directly while speaking with reporters in Washington. He stated that “we needed to protect supply management … and I’m confident that that’s the case.” His comments came shortly after Trump claimed tariffs would be “totally eviscerated” for American farmers.

For Canadian dairy producers, the stakes go beyond trade optics. Supply management also sets domestic production quotas, allowing farmers to avoid overproduction and stabilize prices. Therefore, any expansion of U.S. access could force cuts to those domestic quotas, leading to lost revenue for Canadian processors.

The Dairy Farmers of Canada estimates that expanded U.S. market access already costs Canadian processors more than $140 million annually. In a statement, association president David Wiens said “it is imperative that no more concessions on dairy or supply management are made” during the ongoing talks. This concern reflects a broader fear that even small policy shifts could snowball into larger structural change.

One possible compromise involves reallocating some tariff-rate quotas to retailers or distributors instead of processors. According to University of Waterloo history professor Bruce Muirhead, this move could offer the Trump administration a symbolic win. At the same time, it would not fundamentally alter Canada’s supply management framework. Still, Muirhead admits the real-world impact remains uncertain, saying “I have no idea how this works out in practice.”

Health and Safety Questions Loom Over Imports

Beyond market access, health and production standards add another layer to the debate. Canada’s dairy sector has previously noted that imported products must meet Canadian safety standards, yet the farms producing them are not required to follow Canadian on-farm practices. This distinction matters more than it might first appear.

Many large U.S. dairy operations function as concentrated feeding operations, housing thousands of cows for milk production alone. Muirhead points out that groups such as the Union of Concerned Scientists have flagged these operations for disease risk and environmental strain. In addition, such farms are often exempt from certain U.S. clean air and water regulations.

Some American farms also continue using recombinant bovine somatotropin, a growth hormone banned in Canada. Health Canada has determined that the hormone poses no direct risk to human health. However, it was never approved for sale domestically due to animal health concerns, and current testing methods cannot detect its use in finished products.

Not everyone views this as a major safety issue. Von Massow argues Canadian and American dairy products may differ, yet neither poses an unsafe choice for consumers. On his view, the products would not be identical, but he stated plainly, “Will it be unsafe? No.” Castaneda goes further, dismissing the entire health debate and pointing out that Canadians regularly consume American dairy without complaint.

What Comes Next for Canada’s Dairy Sector

As negotiations continue, Canada faces a delicate balancing act. On one hand, it must show meaningful movement to satisfy U.S. demands and avoid steep tariffs. On the other, it must protect a supply management system that supports thousands of Canadian dairy farmers and processors.

Ultimately, the final deal will likely reallocate portions of existing quotas rather than dismantle the system outright. Whether this satisfies American negotiators, protects Canadian producers, or genuinely benefits consumers still remains to be seen. As Muirhead summarized it, when it comes to the real-world effects, “All of that remains to be seen.”