Most large cities have required the pasteurization of milk and milk products since

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The pasteurization of milk and milk products became widely required in large cities around the year 1900, as a response to concerns about milkborne illnesses and bacteria. It was not required in the 1800s, and while some communities may have begun mandating it in the 1850s or 1920s, these years are much less commonly associated with the introduction of pasteurization mandates.

Most Large Cities Have Required the Pasteurization of Milk and Milk