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EPA Superfund Site

US MAGNESIUM

UT | EPA ID UTN000802704

Human exposure is NOT currently under control

About this site’s exposure pathways: As of September 2025, the US Magnesium Superfund site is considered Current Human Exposure Not Under Control (HENC). Site investigations are occurring to address chemicals of concern [principally organochlorine compounds as Toxic Equivalent (TEQ) toxicity, with contributing arsenic] in soils, sediments, slurry-sludges, waters and air. The exposure pathway is considered unacceptable based on EPA risk-based criteria because cancer-risk thresholds can exceed the regulatory level of 1x10-6 based on preliminary risk-assessment calculation.US Magnesium is an active facility and site investigations are being conducted in coordinated efforts of the EPA Resource Conservation and Recovery Act (RCRA) and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) programs as well as the Utah Department of Environmental Quality. Activities to address Site conditions are being conducted under a RCRA-CERCLA Enforcement Settlement Consent Decree with US Magnesium entered in Federal District Court in June 2021. Human exposure to the contaminated surface-media is presently controlled in a manner that limits the exposure-frequency. Evaluating the source, releases, and exposure scenarios at this site are ongoing. EPA currently anticipates that human exposure will be under control by December 2030. Any questions or concerns about the site should be directed to the Community Involvement Coordinator.

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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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