Landfill Leachate — PFAS and Heavy Metals in Groundwater Contamination (Municipal Solid Waste, Liner Failure, Drinking Water Impact, Environmental Justice) — outdoor safety profile
High riskLandfill leachate — the liquid that percolates through decomposing municipal solid waste and collects at the base of landfill cells — is among the most complex and hazardous aqueous waste streams generated by modern civilization.
What is this product?
Landfill leachate — the liquid that percolates through decomposing municipal solid waste and collects at the base of landfill cells — is among the most complex and hazardous aqueous waste streams generated by modern civilization. A typical municipal solid waste landfill receives consumer products containing thousands of chemical substances, generating leachate with concentrations of PFAS (per- and polyfluoroalkyl substances) ranging from 1,000 to 100,000 ng/L, heavy metals including lead (100-1,000 ug/L), cadmium, chromium, arsenic, and mercury, plus volatile organic compounds, pharmaceutical residues, and endocrine-disrupting chemicals. PFAS are of particular concern because they are not removed by conventional leachate treatment systems and pass through publicly owned treatment works (POTWs) into receiving waterways. EPA's 2024 PFAS Maximum Contaminant Levels (4 ng/L for PFOA and PFOS individually) mean that even highly diluted leachate discharge can cause downstream drinking water exceedances. Landfill liner systems — typically composite geomembrane over compacted clay — have documented failure rates of 5-15% over a 30-year regulatory post-closure period, with leachate breakthrough contaminating shallow groundwater aquifers. Environmental justice analysis consistently shows that landfills are disproportionately sited in low-income communities and communities of color: EPA Environmental Justice screening tool (EJScreen) data confirms that populations within 1 mile of landfills are 17% more likely to be low-income and 10% more likely to be minority than the national average. Groundwater contamination from leachate affects private well users who lack the monitoring and treatment resources available to municipal systems.
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Persistent Contaminant
Heavy Metal Contaminant
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