Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-35-417

(a) A city or town that has operated a sewerage system outside of the corporate boundaries of the city or town for twenty-five (25) years or more shall not cease operating the sewerage system outside of its corporate boundaries so long as the sewerage system maintains sufficient capacity to continue to provide sewerage service outside of its corporate boundaries, as determined by a study, report, or other information and evidence presented to the Tennessee board of utility regulation in a hearing pursuant to § 7-82-702(b)(1)(E).

(b) This section does not affect, impact, or interfere with the rates in existing or future water or wastewater services contractual arrangements, or renewals or extensions of such existing or future agreements.