N.C. Gen. Stat. § 162A-12
Any holder of revenue bonds issued under the provisions of this Article or of any of the coupons appertaining thereto, and the trustee under any trust agreement, except to the extent the rights herein given may be restricted by the resolution authorizing the issuance of such bonds or such trust agreement, may, either at law or in equity, by suit, action, mandamus or other proceeding, protect and enforce any and all rights under the laws of the State or granted hereunder or under such resolution or trust agreement, and may enforce and compel the performance of all duties required by this Article or by such resolution or trust agreement to be performed by the authority or by any officer thereof, including the fixing, charging and collecting of rates, fees and charges for the use of or for the services and facilities furnished by a water system or sewer system.
N.C. Gen. Stat. § 162A-12