EPA Superfund Site

TRAVIS AIR FORCE BASE

CA | EPA ID CA5570024575

About this site’s exposure pathways: As of December 2024, the Travis Air Force Base Superfund site is considered “Insufficient Data to make a Human Exposure evaluation” (HEID) because of a newly identified contaminant(s) of various per- and polyfluoroalkyl substances (PFAS) identified above EPA’s risk screening levels in soils, groundwater, and private drinking water wells off site. PFAS are also present in the effluent of treated groundwater and in sediments and surface water. The site was previously categorized as “Human Exposure Under Control” (HEUC). The soils, surface water, and groundwater remedies do not address the presence of PFAS above screening levels (OUs 2, 4, and 6).

EPA uses this Human Exposure status when there is a lack of evidence to suggest that actual or reasonably anticipated human exposures are occurring and that those exposures are above acceptable risk-based levels. The planned activities to collect sufficient information to evaluate this new exposure pathway and/or contaminants(s) are to conduct a remedial investigation to identify the nature and extent of contamination and potential exposure pathways and risk human health and the environment. The initial results of the first phase of remedial investigation are available, however, these results are insufficient for determining whether human exposures are under control. EPA anticipates that the Human Exposure evaluation can be completed if additional private drinking well data is collected by the Air Force.

In addition, the Air Force is currently providing treated water to private well owners that have total levels of Perfluorooctane sulfonate (PFOS) and Perfluorooctanoic acid (PFOA) concentrations above 70 ng/L as part of an emergency removal action. Out of an abundance of caution, if you live near this site please contact the Air Force to determine if your drinking water well may be impacted. The point of contact information for the Air Force is listed on the EPA website (https://www.epa.gov/superfund/travisafb). This does not necessarily mean that unacceptable exposures are occurring, however, the Air Force has initiated notification to potentially impacted private well owners and have sampled wells when provided with access.