Drainage, Waste & VentQuestion 153 of 360
For a building where sewage must be pumped and continuity of service is essential (such as public use), the CPC generally requires…
a.duplex (two) pumps or ejectors so one can operate if the other fails
b.a single large pump only
c.a gravity bypass to the roof
d.no pump, only a holding tank
Explanation
Where interruption of pumping would create a health hazard, such as buildings used by the public, duplex pumps are required so that a standby unit takes over if one fails. The pumps typically alternate and can run together during peak flow. A single pump risks a sewage backup during any failure.
Law Reference: 2022 California Plumbing Code (CPC) §710.0Practice all 360 questions free — no signup required.
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