Va. Code Ann. § 15.2-5431.12

An authority may make and enter into all contracts or agreements, as the authority may determine, which are necessary or incidental to the performance of its duties and to the execution of the powers granted by this chapter, on such terms and conditions as the authority may approve. The contract shall be subject to such provisions, limitations or conditions as may be contained in the resolution of the authority authorizing revenue bonds of the authority or the provisions of any trust agreement securing such bonds. Such contract may provide for the collecting of fees, rates or charges for the services and facilities rendered to a subscriber thereof services provided by the authority and for the enforcement of delinquent charges for such services and facilities. The provisions of the contract and of any resolution of the governing body shall not be repealed so long as any of the revenue bonds issued under the authority of this chapter are outstanding and unpaid. The provisions of the contract, and of any resolution enacted pursuant thereto, shall be for the benefit of the bondholders.