This story is a partnership between Inside Climate News, Grist and WBEZ, a public radio station serving the Chicago metropolitan region.

CHICAGO—No U.S. city has more toxic lead pipes pumping water into people’s homes. And millions of federal and city dollars earmarked to replace them remain unused, a city official said Monday, at the same time that the city is struggling to keep up with deadlines to warn people of the risks.

Replacements of Chicago’s more than 412,000 confirmed and suspected lead service lines are lagging. The city doesn’t anticipate replacing all its pipes until 2076, some 30 years after a federal deadline . Lead plumbing can leach the toxic metal into drinking water, causing brain damage, developmental delays and other harms.

Water department officials say they can’t

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