Ala. Code § 11-81-27

Any county or municipality of this state may mortgage any public property for the payment of any debt contracted in connection with such mortgaged property either originally or as a renewal, and such mortgage shall be admitted to record in the office of the probate judge of any county of this state without the payment of any tax upon the debt secured thereby or any other fee or charge except the costs of recording the instrument at the rate fixed by law.