25 Pa. Code § 127.461 – Operating permit changes for cause.

An operating permit may be terminated, modified, suspended or revoked and reissued if one or more of the following applies:

(1) The permittee constructs or operates the source subject to the operating permit so that it is in violation of the act, the Clean Air Act, the regulations thereunder, a plan approval, a permit or in a manner that causes air pollution.
(2) The permittee fails to properly or adequately maintain or repair an air pollution control device or equipment attached to or otherwise made a part of the source.
(3) The permittee has failed to submit a report required by the operating permit or an applicable regulation.
(4) The EPA determines that the permit is not in compliance with the Clean Air Act or the regulations thereunder.