Tucson International Airport Area Site; Emergency Administrative Order for Response Action (PWS-AO-2024-10)
On May 29, 2024, EPA Region 9 issued a Safe Drinking Water Act (SDWA) Section 1431 Unilateral Administrative Order (UAO) to the U.S. Air Force and the Arizona Air National Guard, focusing the U.S. Air Force and the Arizona Air National Guard on meeting their responsibilities for protecting drinking water supplies in Tucson, including communities with environmental justice concerns.
This Order requires the Respondents to conduct measures to abate the actual and potential imminent and substantial threat to the health of persons presented by the presence of per- and polyfluoroalkyl substances (collectively “PFAS”) in groundwater underlying the Tucson Area Remediation Project (“TARP”) water well field, which serves as an important source of drinking water for the public water system that serves the City of Tucson.