Drainage, Waste & VentQuestion 65 of 360
Cleanouts in horizontal drainage lines must be spaced no more than:
a.100 feet apart
b.50 feet apart
c.75 feet apart
d.150 feet apart
Explanation
The CPC requires cleanouts in horizontal drainage piping to be installed not more than 100 feet apart measured along the developed length. Spacing at 50 or 75 feet is stricter than required, and 150 feet exceeds the maximum, leaving a run that cannot be fully cleared with standard equipment.
Law Reference: 2022 California Plumbing Code (CPC) §707.4Practice all 360 questions free — no signup required.
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