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Pumpkin Spring, an Arsenic Pool in the Grand Canyon

Pumpkin Spring is a geological oddity is a limestone formation off the Colorado River. Some water spills over the top, but that which remains has a deadly mixture of arsenic, copper, zinc and lead. It's dangerous, but beautiful. View more pictures at the link.

Link | Photo: Flickr user al_hikesaz

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Well, I was going by what Kuriositas said. Yeah, that's a really high figure. According to the EPA, the safe level is 10 parts per billion.

I can't find an immediate source for the arsenic level in Pumpkin Springs, so I've just taken out the entire sentence.
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