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EPA Superfund Site

ADAMS COUNTY QUINCY LANDFILLS 2&3

IL | EPA ID ILD980607055

Exposure status: insufficient data

About this site’s exposure pathways: As of August 2025, there is not sufficient information available to determine the site-wide Human Exposure Control status at the Adams County Quincy Landfills 2 & 3 Superfund Site because of newly identified potential exposure pathways including groundwater ingestion, vapor intrusion (VI), and explosive hazards. The 2023 Five Year Review (FYR) found that per- and polyfluoroalkyl substances (PFAS) were detected in on-site leachate, but it is not known whether the PFAS are migrating into groundwater or whether there are any remaining well users that could be impacted. It is also unknown if 1,4-dioxane is present. The FYR also found landfill gas (LFG) in two on-site passive gas vents above explosive levels. One gas vent is adjacent to the underground leachate collection system, and it is not known whether the LFG poses an explosive hazard to the on-site waste hauler or other maintenance workers.

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Data limitations: Proximity to a Superfund site boundary does not mean your property is contaminated. EPA site boundaries show the area designated for cleanup, not the full extent of contamination. Groundwater plumes can extend beyond site boundaries. This tool shows publicly available EPA federal data. It is not affiliated with or endorsed by EPA, and is not a substitute for a professional environmental assessment.

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