Drainage, Waste & VentQuestion 95 of 360
A cleanout is required at:
a.The top of the stack only
b.No location if the pipe is new
c.The base of each soil or waste stack
d.Every other floor only
Explanation
The CPC requires a cleanout at or near the base (foot) of each vertical soil or waste stack, where solids tend to accumulate as flow turns horizontal. Placing one only at the top or on alternating floors would leave the critical base of the stack inaccessible for rodding. New pipe still requires cleanouts.
Law Reference: 2022 California Plumbing Code (CPC) §707.4Practice all 360 questions free — no signup required.
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