A public agency shall adopt and adjust the rates charged for solid waste management services so that revenues, together with taxes levied to support the services, will be sufficient to pay:
(1) the expense of operating and maintaining the solid waste management system, including a resource recovery system;
(2) the public agency's obligations under a contract; and
(3) the public agency's obligations under and in connection with bonds issued that are secured by revenues from the solid waste management service or a solid waste management system, including a resource recovery system.