For many months now, the city of Milwaukee has been grappling with a lead poisoning crisis that has forced at least four schools to temporarily close and dozens more to undergo rigorous inspections.

It began on January 13, when Milwaukee first notified parents at one grade three to five school that a child had tested positive for high levels of lead in their blood. Local health officials determined the lead exposure did not occur at the child’s home, which left their school as the obvious culprit.

City investigators found chipped lead paint and lead-laden dust throughout the school building; press and government reports indicate that the school district has struggled to keep up with paint maintenance requests, due to a lack of funding and manpower. Local officials soon realized they had a big problem on their hands, as the vast majority of the city’s school buildings (roughly 125 out of 150) were built before 1978, when lead paint was banned.

Lead, a dangerous neurotoxin that can lead to development problems in children after prolonged exposure, has now been detected in at least nine public schools, and at least four students have tested positive for high lead levels in their blood. So far, no children have been hospitalized for acute lead poisoning, which can be life-threatening, but the affected kids continue to be monitored. Several buildings have been temporarily closed so workers can do a deep clean. Milwaukee has been inspecting all of its public schools for lead, with the goal of completing the review by September.

Normally, cities navigating such a crisis could depend on the Centers for Disease Control and Prevention for federal support. When the lead poisoning was first detected........

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