Any locality may exercise its powers to regulate sewage collection, treatment or disposal service and water service notwithstanding any anticompetitive effect. Such regulation may include the establishment of an exclusive service area for any sewage or water system, including a system owned or operated by the locality, the fixing of rates or charges for any sewage or water service, and the prohibition, restriction or regulation of competition between entities providing sewage or water service. No power herein granted shall alter or amend the powers or the duties of any present or future authority created pursuant to the Virginia Water and Waste Authorities Act (§ 15.2-5100 et seq.) nor confer any right or responsibility upon the governing body of any locality which would supersede or be inconsistent with any of the duties or responsibilities of the State Water Control Board.