
The reason Costco milk doesn't spoil after its expiration date
This extended shelf life is attributed to Costco's exceptionally rigorous testing and quality control standards, which exceed typical FDA requirements.
Suppliers face strict annual unannounced audits, and every milk batch undergoes approximately 60 microbial tests, with any failure preventing shipment.
The quality of water used in processing is closely monitored, and milk from healthier herds with lower somatic cell counts is preferred for its longer fridge lifespan.
These stringent measures contribute to reduced food waste and increased customer satisfaction due to the milk's prolonged freshness.

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