50 CFR § 29.180
When must I plug my well?
July 17, 2020
Except as provided in §29.181, you must plug your well, in accordance with the standards and procedures outlined in this subpart, when any of the following occurs:
(a) Your drilling operations have ended and you have taken no further action on your well within 60 calendar days;
(b) Your well, which has been completed for production operations, has no measurable production quantities for 12 consecutive months; or
(c) The period approved in your permit to maintain your well in shut-in status has expired.