Tucson Water has been allocated $2 million in state funding to help restart a treatment plant that was forced to shut down because of severe groundwater contamination.
The new state funding will fast-track efforts to bring the Tucson Airport Remediation Plant (TARP) back online and safely continue treating contaminated groundwater in the area.
Tucson Water will suspend operations of the TARP due to increasing levels of per- and polyfluoroalkyl substances (PFAS) in nearby groundwater while constructing a State-funded temporary pipeline and permanent outfall structure to convey treated water leaving TARP to the dry riverbed of the Santa Cruz River north of Irvington Road. The Arizona Department of Environmental Quality (ADEQ) and Tucson Water are working on an intergovernmental agreement to approve the funding this week.
Tucson Water has operated TARP since 1994 to successfully treat and contain a plume of contaminated groundwater near Tucson International Airport, removing industrial chemicals TCE and 1,4-Dioxane and delivering the cleaned water into the drinking water system. On June 8, the utility announced that out of an abundance of caution and due to rising levels of newer contaminants in the area groundwater (PFAS, also emanating from the airport area), it would suspend operations on June 21 as it seeks alternative end-uses for the treated water. These alternatives include discharge to the Santa Cruz River and/or Tucson Water’s reclaimed water system, which is used for landscape irrigation. Tucson Water assures the public that contaminated water has not been served to customers from TARP. These measures are being pursued to protect public health, and to ensure no contaminants enter the drinking water system in the future.
Arizona’s investment will help the City of Tucson get the plant back online as quickly as possible, which is critical to meeting the plant’s original mission of containing the decades-old plume of groundwater contaminated with TCE and 1,4-Dioxane.
The announcement marks the second time in recent months that the state has had to deploy funds to address PFAS in Tucson’s groundwater supply. In December 2020, ADEQ committed $3.3 million from the state’s limited Water Quality Assurance Revolving Fund to stop PFAS from impacting key Tucson drinking water sources. ADEQ is conducting an accelerated investigation and designing an early response action north of Davis-Monthan Air Force Base to protect Tucson Water’s central wellfield, a critical component of the community’s long-term water supply.
In April, Governor Doug Ducey sent a letter to U.S. Secretary of Defense Lloyd Austin calling on the Department of Defense to take prompt action to address Pentagon-related groundwater contamination near Arizona’s military installations.
To date, Tucson Water has spent over $8 million to address PFAS locally, continuing to test all drinking water sources for the compounds across its 390 square mile service area, turning off contaminated wells and drilling new ones in clean areas, and removing PFAS at TARP. The utility is spending millions more to make a connection to the reclaimed system.
The City of Tucson has filed a lawsuit against the manufacturers of PFAS compounds and will pursue all of its available legal remedies to obtain reimbursement for all of the City’s — and now ADEQ’s — expenses from these and other potentially responsible parties.