25 Pa. Code § 78a.104
Approval of inactive status for a well is valid for 5 years unless revoked. After 5 years, the owner or operator shall plug or return to active status a well granted inactive status unless the Department grants an application for a 1-year extension. The operator of a well granted inactive status may apply for renewal of inactive status by demonstrating that the well continues to satisfy the conditions imposed on the well by §§ 78a.102 and 78a.103 (relating to criteria for approval of inactive status; and annual monitoring of inactive wells).
25 Pa. Code § 78a.104
This section cited in 25 Pa. Code § 78a.91 (relating to general provisions); 25 Pa. Code § 78a.101 (relating to general provisions); and 25 Pa. Code § 78a.105 (relating to revocation of inactive status).