Service lines: Cast iron and ductile iron.

(a)Cast or ductile iron pipe less than 6 inches (152 millimeters) in diameter may not be installed for service lines.#

(b)If cast iron pipe or ductile iron pipe is installed for use as a service line, the part of the service line which extends through the building wall must be of steel pipe.#

(c)A cast iron or ductile iron service line may not be installed in unstable soil or under a building.#