How we mapped Chicago’s lead pipe problem and what we learned

Grist
By Juanpablo Ramirez-FrancoAug 28, 2025, 6:30 am143 pts
Chicago has a lead pipe problem. The city estimates that about 412,000 out 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 connect the city’s water main…

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