The product involved in the recall is the Kirkland Signature brand Organic 1% Partly Skimmed Milk, sold in packs of three one-litre pouches.
According to the official regulatory filing, the milk carries a best-before date of July 12, 2026 and the plant registration code 1490.
Some milk from the Agropur batch was also distributed by other retailers.
The CFIA said consuming milk contaminated with these chemical agents can cause immediate gastrointestinal distress, burning sensations, or nausea.
There have been no officially verified reports of consumer illnesses or adverse medical events linked to consumption.
Costco Canada used its membership networks to alert shoppers who purchased the specific organic milk lot to immediately halt consumption.
Retail managers are authorizing full corporate refunds upon the return of the merchandise to local warehouses.
