925.20 BUILDING SEWER ELEVATION.
   Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor but in no event shall any portion of the building sewer be less than two (2) feet above the crown of the main line sewers. In all buildings at which any building drain is too low to permit gravity to the public sewer, sanitary sewage carried by such building shall be lifted by an approved means and discharged to the building sewer.