Ala. Code § 11-88-62

The board shall have the power to reduce or abate any assessment made for improvements in cases where such assessment has been levied or attempted to be levied against property owned by the State of Alabama or by a county or owned by any church, hospital, or other charitable organization or in any case where the chief executive officer of the board, after due inquiry, has determined that such assessment has been made erroneously or in excess of the benefits derived by such property or is so great as to constitute an undue burden on such property having in view the value thereof, whether or not such assessment shall have been made final and the time to appeal therefrom expired.