Chicago has a lead pipe problem.

The city estimates that about 412,000 of roughly 491,000 water service lines require replacement because they are known or suspected to contain lead. That’s the most of any city in the country.

Service lines are the underground pipes that send water to your home’s plumbing. When these and other plumbing materials contain lead, tiny pieces of the toxic metal can dissolve or flake off into the water coming out of your tap.

The city offers a lookup tool where residents can search for their address to see what their service line is made from. It also provides overall statistics on the number of lines requiring replacement.

But that information has never been mapped in a way that shows the public how the problem with lead service lines is distributed across

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