EPA Superfund site
BILLINGS PCE
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 August 2026, the Billings PCE Superfund site is considered Human Exposure Not Under Control (HENC). Multiple vapor intrusion and groundwater investigations have been completed since the Billings PCE site was finalized for the National Priorities List (NPL) on 9 September 2021, and a human health risk assessment (HHRA) addressing the vapor intrusion pathway was completed in August 2024. The HHRA identified exposures that are above acceptable risk-based levels for multiple contaminants of concern.
A Record of Decision (ROD) for operable unit 1 (OU1) to address the vapor intrusion pathway was signed in June 2026. The site team is currently working on procuring a site contractor to support the remedial design and remedial action with vapor intrusion mitigation systems anticipated to be installed in early 2027. Once all eligible structures have mitigations systems in place and institutional controls have been implemented as part of the OU1 remedial action, human exposure will be under control since there are no known potable uses of the groundwater.
EPA continuously conducts community outreach efforts (e.g., fact sheet, community meetings) and is currently working on the OU2 source area Feasibility Study. The OU2 Proposed Plan is anticipated to be issued in 2027 and will address soil and groundwater impacts from the main source area.