Chicago has had a heavy metal problem for decades. The city is home to more lead service lines – those are the pipes that carry your tap water the final few meters into your home – than any other major metropolitan area in the country. That means that dangerous lead seeps into the water for hundreds of thousands of residents, often unknowingly. The issue has gone unresolved over multiple mayoral administrations, so what’s Mayor-elect Brandon Johnson planning to do differently? Axios Chicago reporter Monica Eng explains how Chicago got into this mess and whether or not Johnson can be the mayor that finally gets us out of it.