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The 10 most interesting and dangerous places in the world

The list is based on a survey of more than 200,000 people who have used or are using water purifiers.

It also includes places with some of the highest water quality.

The list includes locations that are home to some of America’s most polluted water systems, including rivers and lakes.

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The water quality index is based off a comparison of water quality in each of the U.S.’s 28 drinking water systems.

The highest-ranking drinking water system is New York City’s water system, which is rated as the highest in the U, according to the World Health Organization.