The water department shall maintain all water pipes upon city-owned property up to and including the water meter; provided, that the city shall not be required to renew or replace water mains placed outside the corporate limits of the city. No mains in existence at the time of the annexation of an area to the city shall be renewed or replaced by the city without a resolution of the council to do so. Water mains outside the city or in existence at the time of annexation may be maintained by the water department until such time as the city shall condemn the same. (Ord. 369 § 10(f), 1981).