EPA Superfund Site

TOOELE ARMY DEPOT (NORTH AREA)

UT | EPA ID UT3213820894

About this site’s exposure pathways: As of September 2025, the Tooele Army Depot (North Area) Superfund site is considered Insufficient Data to make a Human Exposure evaluation (HEID) because of a historic use and release of suspected Per- and Polyfluoroalkyl Substances (PFAS) containing fire retardant, munitions maintenance and washing material, and vehicle and armor maintenance activities.
Based on the March 2023 Five-Year Review (FYR) report, EPA Region 8 provided an independent finding letter stating there is insufficient information to assess if potential sources of PFAS have impacted soils and groundwater in OU7, OU8 and OU9. A path forward to address PFAS at the site is unclear. Additionally, it is unclear whether other groundwater contaminants (trichloroethylene, TCE) are under control and whether the reduction of such contaminants is exasperated by the presence of PFAS.
The site was previously evaluated by the U. S. Army Environmental Command for the presence of PFAS using analytical methods and as well as sampling methods in terms of type and location of samples, under the Army’s Preliminary Assessment (PA) Site Investigation (SI) program, that are not in compliance with current methods to evaluate soil and groundwater for PFAS. The site was previously categorized as Human Exposure Under Control as it pertains to munitions of explosive concern and munition constituents. The EPA expects to have sufficient information to make a human exposure determination by June 2030, depending on funding for the U.S. Army’s base wide Remedial Investigation. There are no known unacceptable exposure pathways and institutional controls are in place to prevent or limit exposure to previously identified munitions of explosive concern and munition constituents (for example lead) impacting soils.