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EPA Superfund Site

MODESTO GROUND WATER CONTAMINATION

CA | EPA ID CAD981997752

Exposure status: insufficient data

About this site’s exposure pathways: As of September 2024, the Modesto Ground Water Contamination Superfund site is considered “Insufficient Data to make a Human Exposure evaluation” (HEID) because there have been increasing concentrations of tetrachloroethene at the source area. The site was previously categorized as human exposures under control (HEUC).

EPA uses this Human Exposure status when there is a lack of evidence to suggest that actual or reasonably anticipated human exposures are occurring and that those exposures are above acceptable risk-based levels. The planned activities to collect sufficient information are operation of the revised selected remedy. EPA currently anticipates that there will be sufficient data to make a Human Exposure evaluation by 02/07/2025 because the Focused Feasibility Study will have been finalized and an amended Record of Decision will follow thereafter.

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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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