EPA Superfund site
ROCKY MOUNTAIN ARSENAL (USARMY)
Exposure status: insufficient data
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 August 2026, the Rocky Mountain Arsenal Superfund site is considered Insufficient Data to Determine Human Exposure Control Status (HEID) because per- and polyfluoro alkyl substances (PFAS) have been detected in influent and effluent samples collected quarterly at the site’s water treatment plants above the regional screening levels (RSL) but below maximum contaminant limits, and the extent of the contamination has not been fully defined. PFAS are a group of thousands of man-made chemicals that includes Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), GenX PFAS chemicals, and many other chemicals. More information is needed to determine PFAS source areas.
Currently, the planned activities to address this pathway include an expanded monitoring program to provide more information related to water quality. In addition, PFAS was identified as an issue in the 2026 Five-Year Review. More information is needed to delineate the nature and extent and to determine if contamination is coming from anywhere at or from the site.
Please contact Natalie Rymarz ([email protected]) for additional information. The HEID status does not necessarily mean that unacceptable exposures are occurring; rather more information is needed to determine the human exposure control status.
The Army has an on-going informational program including a newsletter and participation in the Site-specific Advisory Board (SSAB).