In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by approved artificial means and discharged to the building sewer. Where installed, such installations shall be maintained by the owner at his expense and installed on his property. (§ 308, Ord. 497; as amended by § 2, Ord. 1470, eff. July 14, 2016)