Ariz. Admin. Code § R18-12-951
A. Implementation of requirements. Owners and operators shall comply with the requirements of this Article for UST systems with field-constructed tanks and airport hydrant systems as follows:
1. For UST systems installed on or before January 1, 2020, the requirements are effective according to the following schedule:
| Requirement | Effective Date |
| Upgrading UST systems; general operating requirements; and operator training | March 1, 2020 |
| Release detection | March 1, 2020 |
| Release reporting, response, and investigation; closure; financial responsibility and notification (except as provided in subsection (B)) | January 1, 2020 |
New Section made by final rulemaking at 25 A.A.R. 3123, effective January 1, 2020 (Supp. 19-4).