Lead & Heavy Metal Contamination: 1,887 U.S. ZIP Codes at Risk
ToxIndex analysis of EPA Superfund data reveals that nearly 2,000 ZIP codes have lead, mercury, or arsenic as the primary contaminant at nearby hazardous waste sites. These heavy metals do not break down — they accumulate in soil, water, and human tissue.
The Data: Heavy Metal Contamination
Of the 42,354 ZIP codes analyzed against EPA facility data, 1,887 have a heavy metal — lead, mercury, arsenic, cadmium, or chromium — as the primary identified contaminant at the nearest Superfund site.
Data: EPA Superfund Enterprise Management System (SEMS), analyzed by ToxIndex. Updated May 2026.
Why Heavy Metals Are Different
Unlike organic chemicals that eventually break down, heavy metals are elements — they persist in the environment indefinitely. Lead deposited in soil 50 years ago is still lead today. This permanence creates a unique set of risks:
- Soil accumulation — Children playing in contaminated yards ingest lead through hand-to-mouth contact. The CDC states there is no safe blood lead level in children.
- Water infiltration — Mercury and arsenic leach from contaminated sites into groundwater, affecting private wells and municipal supplies.
- Food chain bioaccumulation — Mercury concentrates as it moves up the food chain, with fish from contaminated waterways posing the highest dietary risk.
- Property value impact — EPA studies show properties within 1 mile of a lead-contaminated Superfund site lose 5-15% of assessed value.
Check Your ZIP Code
Enter your ZIP to see if volatile organic compounds have been detected near your home.
Testing Your Home
If your ZIP code shows heavy metal contamination, these are the recommended testing steps:
- Soil testing — Collect samples from bare soil within 3 feet of your foundation and any play areas. EPA-certified labs charge $20-50 per sample.
- Water testing — If you have a private well, test for lead, arsenic, and mercury. Municipal water users can request their utility’s annual Consumer Confidence Report.
- Blood lead testing — For children under 6, request a blood lead level (BLL) test from your pediatrician. Levels above 3.5 μg/dL require intervention.
- Indoor dust wipe — EPA-certified lead dust wipe kits can identify lead contamination inside your home from deteriorating paint or tracked-in soil.
Remediation Options
Soil capping (covering contaminated soil with clean soil and landscaping fabric) is the most cost-effective approach for residential yards. Full excavation and replacement is more expensive but removes the source permanently. For water, reverse osmosis (RO) systems effectively remove lead and arsenic to below EPA maximum contaminant levels.
Frequently Asked Questions
Soil near homes built before 1978 and near industrial sites is most likely contaminated. EPA considers soil lead levels above 400 ppm hazardous for play areas and above 1,200 ppm for non-play areas. Use the ToxIndex ZIP search to check if your area has EPA-tracked lead contamination, then order a certified soil test.
Yes. EPA research shows properties within 1 mile of a Superfund site with heavy metal contamination lose 5-15% of assessed value. However, completed remediation can recover most of this loss. Documented clean soil tests can support property valuations.
Municipal water systems are required to test for lead under the EPA Lead and Copper Rule. However, contamination can occur between the treatment plant and your tap through lead service lines. Request your water utility Consumer Confidence Report and consider a certified lead water test kit ($15-30).
Data Sources: EPA SEMS, EPA FRS, CDC Lead Prevention Program, HUD Office of Lead Hazard Control. Analyzed by ToxIndex.
This analysis is based on publicly available government data and does not constitute medical advice. For health concerns related to lead exposure, consult your physician or contact your local health department.