By Matt Soniak, Mental_Floss.com

Have you ever wondered why that bottle of Poland Spring has a “drink by” date on it when common sense dictates that water doesn’t go bad? You can thank the great state of New Jersey.  A 1987 NJ state law required all food products sold there to display an expiration date of two years or less from the date of manufacture.

Labeling, separating and shipping batches of expiration-dated water to the Garden State seemed a little inefficient to bottled water producers, so most of them simply started giving every bottle a two-year expiration date, no matter where it was going.

Now, the U.S. Food and Drug Administration has never established or suggested a limitation on the shelf life of bottled water as long as it’s produced in accordance with regulations and the bottle remains properly sealed. Makes sense, because it’s, you know…water. Even Dirty Jerz caught on to this fact and amended the law a few years ago. But the expiration date has been an industry norm for so long that many producers have just kept it on there.

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~Sandy G.