1,4-Dioxane

Monthly Report: Tucson Airport Remediation Project Summary December 2020(PDF, 921KB)

Unified Community Advisory Board

A Unified Community Advisory Board (UCAB) was formed in 1995, comprised of area residents and government agencies. Anyone interested in preserving groundwater quality and learning more about the process of removing TARP-area contaminants may attend a UCAB quarterly meeting.

Next meeting

Date: TBD
(Please check with one of the contacts listed below for more information.)
Time: TBD
Location: TBD
Contacts: Yolanda Herrera (520) 991-3307 or Mary Aycock (415) 972-3289
More information at the EPA's Tucson International Airport Area page.

1,4-dioxane was used as a stabilizer in industrial solvents in aircraft manufacturing facilities from the 1940s to the 1970s. It was detected in groundwater at the Tucson Airport Remediation Project (TARP) well field. The EPA does not regulate 1,4-dioxane; however, it issued a new health advisory for drinking water utilities. Tucson Water constructed a new treatment facility with state-of-the-art technology to effectively remove 1,4-dioxane from water.

Construction of the Advanced Oxidation Process (AOP) Water Treatment Facility began in July 2012 and was completed in January 2014. It operates in conjunction with the adjacent TARP facility to produce up to seven million gallons of purified water a day.

Additional Information:

• Frequently Asked Questions About 1,4-Dioxane(PDF, 86KB)
• 1,4-Dioxane Tucson Water Fact Sheet(PDF, 69KB)
• 1,4-Dioxane pamphlet(PDF, 525KB)
• 1,4-Dioxano folleto(PDF, 531KB)
• U.S. EPA 1,4-Dioxane Chemical Fact Sheet
• Interstate Technology and Regulatory Council report on per- and polyfluoroalkyl substances (April 2020)