If the lowest fixture or outlet in any building is below the rim elevation of the nearest manhole, cleanout or riser upstream from the connection to the public sewer, a backwater valve or overflow device of an approved type shall be installed in the building sewer.
(1995 Code, § 7.20.410) (Ord. 17-03, passed 3-21-2017; Ord. 15-02, passed 5-5-2015)