N.C. Gen. Stat. § 166A-49

Any party state rendering aid in another state pursuant to this Compact shall be reimbursed by the party state receiving the aid for any loss or damage to or expense incurred in the operation of any equipment and the provision of any service in answering a request for aid and for the costs incurred in connection with the requests; provided, that any aiding party state may assume in whole or in part the loss, damage, expense, or other cost, or may loan the equipment or donate the services to the receiving party state without charge or cost; and provided further, that any two or more party states may enter into supplementary agreements establishing a different allocation of costs among those states.