UST Rule Effective Dates: What Changed and When
Which rule applies to a tank usually depends on when it went in the ground. These are the dates that split one requirement from another.
Read from the regulator's own text and checked on 28 August 2026.
Federal
| Date | What changed | Section |
|---|---|---|
| 8 May 1986 | Notification of a tank system's existence required within 30 days of bringing it into use. | 280.22(a) |
| 13 October 2015 | The 2015 UST rule published. Systems brought into use after this date meet the spill, sump and overfill testing requirements at installation. | 280.35(b)(2) |
| 11 April 2016 | Piping installed or replaced after this date is monitored every 30 days rather than using the tightness testing alternative. Tanks likewise. | 280.41(a)(2), 280.41(b)(2) |
| 13 October 2018 | Walkthrough inspections begin. First spill prevention, containment sump and overfill inspections due for systems in use on or before 13 Oct 2015. Annual release detection operability testing begins. | 280.36(a), 280.35(b)(1), 280.40(a)(3) |
Connecticut
5 August 2025
All newly installed tanks must have continuous interstitial monitoring covering both primary and secondary containment, using inert gas, liquid or vacuum.
5 August 2025
Any entity intending to offer an A/B operator training programme in CT had to submit a new programme for DEEP approval.
7 May 2027
All interstitial spaces must be continuously monitored for double walled tanks and piping. Retrofitted tanks are treated as category 3A.
Sources
Longer write-ups at FastDragon
Fuel Data Portal is published by FastDragon Software, which sells compliance software to fuel operators. It publishes a longer piece on each of these requirements.