The following information and resources are to help Underground Storage Tank (UST) owners/operators operate their facilities in compliance with environmental standards.

Operator Training

UST operators must complete training that meets regulatory requirements to ensure they operate UST systems safely and appropriately. Operators can take Class A,B, or C operator training through any provider they choose | Learn More >

Financial Responsibility

Required by state and federal law, financial responsibility demonstrates that UST owners and/or operators have the capacity to cover costs related to the cleanup of leaking USTs | Learn More >

Reporting Suspected Releases

UST owners and operators must report a suspected release of regulated substances to ADEQ within 24 hours of discovering it. Even without the presence of stained soils or fuel odor, leak detection equipment or other indicators may suggest a release has occurred from the UST system | Learn More >

Notification Form

Owners of regulated underground storage tanks (USTs) must use ADEQ notification forms to register their USTs and provide updates on tank status, ownership, or operator changes | Learn More >

Requirements for Changing Stored Products

UST owners and operators must notify ADEQ and prove their equipment is compatible at least 30 days prior to switching to a fuel blend containing greater than 10% ethanol, greater than 20% biodiesel, or any blend of isobutanol. UST owners and operators should submit this notice and supporting documents using the UST Change of Substance Reporting Form | View Forms >

If ADEQ determines that the information proves the equipment is compatible with the new fuel blend, the UST owner or operator must then submit an updated UST Notification Form to report the change in the stored product. Visit the UST Notification Form page for more information | Learn More >

ADEQ-Certified UST Service Providers for UST Work

Arizona regulations prohibit anyone from performing tank services on a regulated UST unless they hold a current, valid certification for that category of work or are supervised by an ADEQ-certified service provider who holds that certification | Learn More >

Installation, Modification and Closure Plan Reviews

Prior to the new installation, modification, or closure of an UST system, the facility must submit plan review information to ADEQ to ensure that the work is conducted according to current performance standards | Learn More >

Inspections and Compliance

ADEQ inspects UST facilities to ensure they comply with Arizona regulations. During an inspection, inspectors verify UST equipment is operating properly by reviewing:

• Equipment testing documentation
• Release detection documentation
• Compatibility documentation 
• A physical evaluation of the facility and UST related equipment  

Inspectors can help owners and operators understand how routine system testing and maintenance prevent UST releases. If an owner or operator fails to prove compliance, ADEQ may take enforcement action, which can include a fuel delivery prohibition | Learn More >

UST Guidance Documents and Other Resources |  View >