Cal. Code Regs. tit. 3 § 587
In accordance with the requirements of Section 33768 of the Food and Agricultural Code, floor drains or sewage drains with exposed pipes within any product processing or packaging room or any room where processing or clean packaging equipment is handled or kept, shall be constructed in a leak-proof manner. Screw-joint pipe and no-hub-band joints, when correctly installed, are considered leak-proof. Pipe supports shall be installed to maintain pipe alignment. Bell-hub joints shall be completely enclosed with a metal sheeting sloped sufficiently toward an outlet in the sheathing at floor level to readily detect leakage in the drainage or sewer pipe, and shall be of such construction as to permit removal of the sheathing for repairing any leakage that might occur in the drainage or sewer pipe line or sealed in a manner acceptable to the Director.
Cal. Code Regs. Tit. 3, § 587