The EPA rarely retests homes in the nation’s largest residential lead Superfund site after cleanups. ProPublica performed independent tests and found dangerous lead levels persisting in many yards, putting families at continued risk.
The Superfund site covers multiple communities where historical mining and smelting operations contaminated soil with lead. The EPA removes tainted dirt from residential yards under a federal program, yet it seldom returns to verify results years afterward. Thousands of homes remain potentially exposed without follow-up checks.
ProPublica collected soil samples from dozens of properties across the area. Laboratory results revealed that lead concentrations in several yards still exceeded federal safety standards, even in locations previously addressed by the agency. These findings suggest that initial cleanups may not always hold or that new contamination occurs over time.
Local families voiced concerns about health impacts, especially on children whose development can suffer from lead exposure. Experts recommend regular monitoring to catch problems early. The investigation underscores gaps in oversight that leave residents vulnerable long after official efforts conclude.
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