Lead Still Haunts Yards in Exide Battery Recycler Cleanup Zone

Why It Matters

Persistent lead exposure endangers children’s brain development and erodes public confidence in the nation’s largest residential environmental remediation, likely prompting stricter oversight and additional funding.

Key Takeaways

• 73% of cleaned homes still exceed state lead limits
• Study tested 1,100+ samples from 370 homes within/near cleanup zone
• 89% of homes outside 1.7‑mile zone show elevated lead
• $700 million spent; over 6,100 properties claimed remediated
• DTSC plans limited post‑cleanup testing, but full data not released

Pulse Analysis

The Exide Technologies site in Vernon, once a century‑old lead‑acid battery smelter, has become a cautionary tale for large‑scale environmental remediation. When the plant closed in 2015, state regulators launched an unprecedented $700 million effort to excavate contaminated soil from thousands of homes, schools and parks across Southeast Los Angeles County. The plan targeted the removal of up to 18 inches of surface soil, a strategy that, on paper, should have eliminated the primary pathway for lead exposure in residential yards. Yet the sheer scale of the operation, combined with logistical challenges around structures, walkways and mature trees, left critical hotspots untouched.

A recent independent analysis published in *Environmental Science & Technology* paints a starkly different picture. By testing over 1,100 soil samples, researchers discovered that 73% of homes labeled as “remediated” still contain lead levels above California’s residential threshold, and an alarming 89% of properties just beyond the official 1.7‑mile cleanup boundary also exceed safe limits. These findings underscore a systemic flaw: without comprehensive post‑remediation testing, contaminants can linger in pockets that backhoes cannot reach, and mishandling of excavated material can inadvertently spread lead to neighboring lots. For children, even low‑level chronic exposure can impair cognitive development, translating into lifelong educational and economic disadvantages.

The implications extend beyond the Exide site. The DTSC’s reluctance to release underlying data and its limited commitment to re‑testing only a fraction of homes raise questions about accountability in environmental justice initiatives. Communities already burdened by historic pollution now face uncertainty about the safety of their backyards, potentially prompting lawsuits, additional funding requests, and a reevaluation of remediation standards nationwide. Transparent, science‑driven monitoring and community‑involved oversight will be essential to restore trust and ensure that future cleanups truly protect public health.