Science

The drinking water in Flint is missing a critical ingredient, but you might be surprised by what's in your tap

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The lead-poisoning crisis plaguing Flint, Michigan might have you wondering: If tap water can be so dangerous, what's in the stuff I'm drinking?

The now-famous city began drawing its water — which it initially sourced from Detroit — from the Flint River in 2014 to save money. But the water from Flint was highly corrosive, causing it to begin leaching the lead from the town's outdated plumbing system into the water.

Special ingredients like orthophosphates can be added to the water supply to keep this from happening, but the city failed to include them.

Lead tests on the city's tap supply have shown levels of the toxic metal ranging from 27 parts per billion — close to double the 15 ppb amount that's considered a cause for concern by the EPA — to an exceedingly high 158 ppb.

While most drinking water should have little-to-no lead, it has a surprising number of other added ingredients — most of which actually make it safe to drink. Take a look:

BI_Graphics_what should and shouldnt be in your water v2
Dragan Radovanovic

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Erin was a senior health and tech reporter at Business Insider based in San Francisco, where she focused on startups and Silicon Valley. She's broken news on a variety of life science and health-tech stories, including: Before joining BI, Erin worked as a freelance health and science reporter for outlets including Newsweek, Popular Science, and Scientific American. Erin graduated summa cum laude from the University of California, San Diego and received her master's from the Newmark Graduate School of Journalism in New York, where she spent an extra semester completing her degree after breaking both wrists in a snowboarding accident.
A recent arrival to NYC, Dragan is a Graphic Design Intern with Business Insider where he works with the design team to create illustrations and infographics. On his time off he likes to scour the depths of eBay for bike parts, old cars and film cameras.