This story was originally published by The New Lede .

More than 200 million people are at risk of drinking tap water contaminated with chemicals that cause cancer, liver damage, birth defects and other reproductive harms, according to research released Wednesday that includes an interactive map of high-risk hot spots.

The map , developed by the Environmental Working Group (EWG), focuses on arsenic, chromium-6 and nitrate — all scientifically known to cause cancer and other health problems.

Nitrates, commonly generated by the use of fertilizers on farmland, not only have been shown to cause cancer but also to negatively impact blood oxygen levels in babies. Infants who consume nitrates in drinking water can suffer from what is known as “blue baby syndrome.” As well, research shows

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