Lead Emissions from Manufacturing: Sources and Declining Trends
Lead is a heavy metal with no safe level of exposure — even small amounts can cause irreversible neurological damage, particularly in children. Industrial lead emissions have been one of the major environmental success stories of the past 50 years: the phase-out of leaded gasoline in the 1970s–1990s produced the single largest reduction in ambient lead exposure in U.S. history. But industrial manufacturing remains a significant source of lead releases, and TRI data tracks them carefully.
Industrial Sources of Lead Releases
The largest industrial sources of lead TRI releases are primary and secondary metal smelting and refining operations (particularly lead-acid battery recycling plants), iron and steel foundries, and some chemical manufacturing operations. Secondary lead smelters — which melt down used lead-acid batteries to recover the lead — are heavily concentrated in the South and Midwest and have been the subject of numerous enforcement actions and community health investigations. Find lead-releasing facilities by browsing our chemical index.
TRI Lead Trends Since 1990
Total TRI lead releases have declined substantially since the early 1990s, driven by regulatory pressure, technology improvements, and industry consolidation. But the trend has not been uniform: some facility types have shown significant reductions while others have shown minimal change. Air emissions of lead have declined more than land disposal figures, reflecting the greater regulatory pressure on airborne lead under the CAA\'s lead NAAQS. EPA tightened the lead air quality standard in 2008, which triggered new compliance requirements for facilities near monitoring stations.
Health Context: Children and Lead Exposure
While industrial lead emissions have decreased, childhood lead exposure remains a significant public health issue — now primarily from legacy sources (lead paint in older housing, lead pipes in water service lines) rather than current industrial emissions. However, industrial lead sources are still relevant for communities near smelters and battery recycling operations, where airborne lead from industrial operations adds to the cumulative exposure burden. For neighborhood data on housing age and income levels that predict lead paint risk, CensusDepth provides ACS housing and demographic data. Browse enforcement actions related to lead facilities at our enforcement index.