EPA Superfund site
LETTERKENNY ARMY DEPOT (PDO AREA)
Human exposure is NOT currently under control
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.
About this site's exposure pathways
As of April 2026, the Letterkenny PDO Superfund site is considered “Current Human Exposure Not Under Control” (HENC). Newly identified contaminants, per-and polyfluoroalkyl substances (PFAS), have been detected in private drinking water off-base. There are wells which are above the Pennsylvania Maximum Contaminant Levels (MCLs) and EPA MCLs for PFOA and PFOS that have not been addressed.
Currently, the planned activities by the Army to address this pathway are expanded residential sampling and performing an Engineering Evaluation/Cost Analysis process to provide alternative drinking water. A Remedial Investigation is ongoing to determine the nature and extent of the PFAS contamination at the base. EPA currently anticipates that human exposure will be under control by April 2027 because alternative drinking water will be provided to eliminate this exposure pathway.