What's in a glass of water?

With nearly limitless beverage options, you might not realize how much variety exists in the seemingly bland realm of tap water. This colorless refreshment can vary widely from city to city, house to house, or even sink to sink. Scroll over the image below to see some surprising items that might show up in your H₂O.

Photo by The Vorhees

This article was originally published in the March/April 2017 issue of Popular Science.

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