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PFAS Contamination Plume to Private Domestic Wells (Firefighting AFFF, Industrial Sources, Septic Effluent — No EPA MCL Enforcement, State-Level Patchwork) — household safety profile

High risk

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PFAS contamination of private domestic wells from firefighting-foam (AFFF) plumes, industrial-discharge groundwater plumes, and septic-system effluent is the leading emerging-contaminant private-well exposure category in the post-2020 timeframe.

What is this product?

PFAS contamination of private domestic wells from firefighting-foam (AFFF) plumes, industrial-discharge groundwater plumes, and septic-system effluent is the leading emerging-contaminant private-well exposure category in the post-2020 timeframe. The EPA April 2024 PFAS National Primary Drinking Water Regulation (NPDWR) sets MCLs of 4.0 ng/L for PFOA and PFOS, 10 ng/L each for PFNA, PFHxS, and HFPO-DA (GenX), and Hazard Index 1.0 for mixtures — but these regulations apply ONLY to public water systems. Private wells are entirely owner-managed; DoD AFFF transition (NDAA 2020) and CERCLA PFOA/PFOS hazardous-substance designation (2024) create federal cleanup authority for sites near DoD facilities but do not extend MCL enforcement to private wells. The dominant impact pathways are (1) AFFF plumes from military-base, civilian-airport, and oil-and-gas-pad firefighting foam use; (2) industrial-discharge plumes from chrome-plating, paper-mill, semiconductor-fab, and chemical-manufacturing sites; (3) septic-system effluent containing PFAS-treated consumer-product residues (carpet, textile, food-packaging) reconcentrated through the leach field. State-level PFAS private-well guidance varies widely: MI, NH, NJ, MN, ME aggressive; many other states minimal. Most private wells are never tested for PFAS unless an active investigation or real-estate transfer triggers it. The detection problem is severe: PFAS analysis by EPA Method 537.1 / 533 / 1633 requires specialty laboratories at $200-500 per sample, far above the routine well-test threshold.

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Pfas Class Total

Pfas Class Broader

Pfoa Specific

Pfos Specific

Afff Source

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